{"product_id":"ugreen-bluetooth-5-4-transmitter-and-receiver","title":"UGREEN 45812 CM872 Bluetooth 5.4 TX\/RX Audio Adapter","description":"\u003cstyle\u003e\/* UGREEN India product description layout *\/\n.ugd-story { --ugd-acc: #169b45; --ugd-ink: #14181c; --ugd-text: #4a5258; --ugd-line: #e3e6e8; --ugd-soft: #f4f5f6; color: var(--ugd-ink); font: 16px \/ 1.7 -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Arial, sans-serif; width: 100%; max-width: 1200px; margin: 0px auto; container-type: inline-size; text-align: left; overflow-wrap: anywhere; }\n.ugd-story * { box-sizing: border-box; }\n.ugd-story :is(h2, h3, h4, p, figure, ul, ol, dl, dd) { margin: 0px; padding: 0px; }\n.ugd-story :is(h2, h3, h4) { color: var(--ugd-ink); font-weight: 700; letter-spacing: -0.02em; text-transform: none; }\n.ugd-story h2 { font-size: clamp(26px, 4.2cqi, 42px); line-height: 1.15; }\n.ugd-story h3 { font-size: clamp(21px, 3cqi, 30px); line-height: 1.2; }\n.ugd-story h4 { font-size: 18px; line-height: 1.35; }\n.ugd-story p { color: var(--ugd-text); font-size: 16px; line-height: 1.7; }\n.ugd-story p + p { margin-top: 10px; }\n.ugd-story img { display: block; width: 100%; height: auto; border: 0px; border-radius: 14px; background: var(--ugd-soft); }\n.ugd-story a { color: var(--ugd-acc); }\n.ugd-story .ugd-eyebrow { display: block; color: var(--ugd-acc); font-size: 12px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 10px; }\n.ugd-story .ugd-section { padding: clamp(36px, 6cqi, 64px) 0px; border-top: 1px solid var(--ugd-line); }\n.ugd-story .ugd-head { max-width: 720px; margin-bottom: 24px; }\n.ugd-story .ugd-head p { margin-top: 10px; }\n.ugd-story .ugd-hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(20px, 4cqi, 48px); align-items: center; background: var(--ugd-soft); border-radius: 20px; padding: clamp(22px, 4cqi, 48px); }\n.ugd-story .ugd-hero p { margin-top: 14px; font-size: 17px; }\n.ugd-story .ugd-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; list-style: none; }\n.ugd-story .ugd-chips li { background: rgb(255, 255, 255); border: 1px solid var(--ugd-line); border-radius: 999px; padding: 5px 12px; font-size: 13px; font-weight: 600; color: var(--ugd-ink); }\n.ugd-story .ugd-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0px; margin: 16px 0px 0px; border: 1px solid var(--ugd-line); border-radius: 16px; overflow: hidden; }\n.ugd-story .ugd-stats div { padding: 16px 18px; border-left: 1px solid var(--ugd-line); }\n.ugd-story .ugd-stats div:first-child { border-left: 0px; }\n.ugd-story .ugd-stats b { display: block; font-size: clamp(20px, 2.8cqi, 28px); line-height: 1.1; color: var(--ugd-ink); }\n.ugd-story .ugd-stats span { display: block; font-size: 13px; color: var(--ugd-text); margin-top: 4px; }\n.ugd-story .ugd-nav { display: flex; gap: 8px; overflow-x: auto; padding: 16px 0px; margin: 0px; list-style: none; scrollbar-width: none; }\n.ugd-story .ugd-nav::-webkit-scrollbar { display: none; }\n.ugd-story .ugd-nav a { flex: 0 0 auto; display: block; padding: 7px 14px; border-radius: 999px; background: var(--ugd-soft); color: var(--ugd-ink); font-size: 13px; font-weight: 600; text-decoration: none; white-space: nowrap; }\n.ugd-story .ugd-tests { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; list-style: none; }\n.ugd-story .ugd-tests li { background: var(--ugd-soft); border-radius: 14px; padding: 16px; }\n.ugd-story .ugd-tests b { display: block; font-size: clamp(24px, 3.2cqi, 32px); line-height: 1; color: var(--ugd-acc); }\n.ugd-story .ugd-tests strong { display: block; margin-top: 8px; font-size: 16px; }\n.ugd-story .ugd-tests span { display: block; font-size: 13px; color: var(--ugd-text); margin-top: 2px; line-height: 1.45; }\n.ugd-story .ugd-note { font-size: 13px !important; margin-top: 12px; }\n.ugd-story .ugd-feature { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(18px, 4cqi, 48px); align-items: center; }\n.ugd-story .ugd-feature + .ugd-feature { margin-top: clamp(28px, 5cqi, 56px); }\n.ugd-story .ugd-feature.ugd-rev figure { order: 2; }\n.ugd-story .ugd-feature ul { margin-top: 14px; padding-left: 20px; }\n.ugd-story .ugd-feature li { color: var(--ugd-text); margin-top: 6px; }\n.ugd-story .ugd-uses { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }\n.ugd-story .ugd-uses figcaption { font-weight: 600; margin-top: 8px; font-size: 15px; }\n.ugd-story .ugd-box { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(18px, 4cqi, 40px); align-items: start; }\n.ugd-story .ugd-box ol { columns: 2; column-gap: 24px; padding-left: 22px; }\n.ugd-story .ugd-box li { color: var(--ugd-text); break-inside: avoid; margin-bottom: 6px; }\n.ugd-story .ugd-specs { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--ugd-line); }\n.ugd-story .ugd-specs div { display: grid; grid-template-columns: 42% 1fr; gap: 12px; padding: 12px 0px; border-bottom: 1px solid var(--ugd-line); }\n.ugd-story .ugd-specs div:nth-child(2n+1) { padding-right: 24px; }\n.ugd-story .ugd-specs dt { font-weight: 600; font-size: 14px; }\n.ugd-story .ugd-specs dd { color: var(--ugd-text); font-size: 14px; }\n.ugd-story details { border-bottom: 1px solid var(--ugd-line); }\n.ugd-story summary { cursor: pointer; list-style: none; padding: 16px 32px 16px 0px; font-weight: 600; font-size: 16px; position: relative; }\n.ugd-story summary::-webkit-details-marker { display: none; }\n.ugd-story summary::after { content: \"+\"; position: absolute; right: 4px; top: 12px; font-size: 22px; color: var(--ugd-acc); }\n.ugd-story details[open] summary::after { content: \"–\"; }\n.ugd-story details p { padding: 0px 0px 16px; }\n.ugd-story .ugd-trust { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; list-style: none; background: var(--ugd-ink); border-radius: 18px; padding: clamp(18px, 3cqi, 28px); }\n.ugd-story .ugd-trust li { color: rgb(255, 255, 255); font-size: 14px; line-height: 1.45; }\n.ugd-story .ugd-trust b { display: block; color: rgb(255, 255, 255); font-size: 15px; }\n.ugd-story .ugd-trust span { color: rgb(185, 194, 199); }\n@container (max-width: 700px) {\n.ugd-story .ugd-hero, .ugd-story .ugd-feature, .ugd-story .ugd-box { grid-template-columns: 1fr; }\n.ugd-story .ugd-hero figure { order: -1; }\n.ugd-story .ugd-feature.ugd-rev figure { order: 0; }\n.ugd-story .ugd-stats { grid-template-columns: 1fr 1fr; }\n.ugd-story .ugd-stats div:nth-child(3) { border-left: 0px; }\n.ugd-story .ugd-stats div:nth-child(n+3) { border-top: 1px solid var(--ugd-line); }\n.ugd-story .ugd-tests { grid-template-columns: 1fr 1fr; }\n.ugd-story .ugd-uses { grid-template-columns: 1fr 1fr; }\n.ugd-story .ugd-uses figure:last-child { grid-column: 1 \/ -1; }\n.ugd-story .ugd-specs { grid-template-columns: 1fr; }\n.ugd-story .ugd-specs div:nth-child(2n+1) { padding-right: 0px; }\n.ugd-story .ugd-trust { grid-template-columns: 1fr 1fr; }\n}\n@container (max-width: 380px) {\n.ugd-story .ugd-box ol { columns: 1; }\n}\n.ugd-story .ugd-feature.ugd-noimg { grid-template-columns: 1fr; max-width: 780px; }\n.ugd-story .ugd-stats.ugd-s2 { grid-template-columns: 1fr 1fr; }\n.ugd-story .ugd-uses figcaption, .ugd-story figure figcaption { color: var(--ugd-ink); }\n.ugd-story .ugd-box.ugd-noimg { grid-template-columns: 1fr; }\n.product-details rte-formatter \u003e .ugd-wide { max-width: none !important; width: 100% !important; }\n.product-details rte-formatter \u003e .ugd-story.ugd-wide { max-width: 1200px !important; }\n.ugd-story ul.ugd-nav,.ugd-story ul.ugd-chips,.ugd-story ul.ugd-trust{list-style:none!important;padding-left:0!important;margin-left:0!important}.ugd-story ul.ugd-nav li,.ugd-story ul.ugd-chips li,.ugd-story ul.ugd-trust li{list-style:none!important}.ugd-story ul.ugd-nav li::before,.ugd-story ul.ugd-chips li::before,.ugd-story ul.ugd-trust li::before,.ugd-story ul.ugd-nav li::marker,.ugd-story ul.ugd-chips li::marker{content:none!important;display:none!important}\n\u003c\/style\u003e\u003cdiv class=\"ugd-story ugd-wide\"\u003e\n\u003cheader class=\"ugd-hero\"\u003e\u003cdiv\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cul class=\"ugd-chips\"\u003e\n\u003cli\u003eCM872 • 3.5MM TX\/RX • DUAL PAIRING\u003c\/li\u003e\n\u003cli\u003eBluetooth 5.4\u003c\/li\u003e\n\u003cli\u003eSKU 45812\u003c\/li\u003e\n\u003cli\u003eCM872\u003c\/li\u003e\n\u003cli\u003eTX + RX\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/header\u003e\u003cdiv class=\"ugd-stats\"\u003e\n\u003cdiv\u003e\n\u003cb\u003e5.4\u003c\/b\u003e\u003cspan\u003eBluetooth version\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eTX and RX\u003c\/b\u003e\u003cspan\u003eModes\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eUp to 16h TX \/ 18h RX\u003c\/b\u003e\u003cspan\u003eRuntime\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e2.400–2.4835GHz\u003c\/b\u003e\u003cspan\u003eWorking band\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cnav\u003e\u003cul class=\"ugd-nav\"\u003e\n\u003cli\u003e\u003ca href=\"#ugd-features\"\u003eFeatures\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#ugd-specs\"\u003eSpecifications\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"#ugd-faqs\"\u003eFAQs\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/nav\u003e\u003cdiv class=\"ugd-section\" id=\"ugd-features\"\u003e\n\u003cdiv class=\"ugd-head\"\u003e\n\u003cspan class=\"ugd-eyebrow\"\u003eFeatures\u003c\/span\u003e\u003ch3\u003eWhat it does well.\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eKey features\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eRole.\u003c\/b\u003e a rechargeable two-way 3.5mm Bluetooth audio adapter for transmitting from wired sources to Bluetooth listeners or receiving phone\/tablet audio on a wired AUX system.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAudio path.\u003c\/b\u003e In TX, audio enters through the attached 3.5mm plug from a TV, airplane seat, computer or gym machine and travels to Bluetooth headphones\/speakers. In RX, phone\/tablet audio arrives by Bluetooth and exits the plug into a car, powered speaker or stereo AUX input.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCodec boundary.\u003c\/b\u003e No codec list is published for the India Bluetooth 5.4 revision. SBC, AAC, aptX, LDAC and LC3 are not asserted beyond whatever compatible endpoints negotiate.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePower design.\u003c\/b\u003e Up to 18 hours in RX mode and 16 hours in TX mode. Figures are test maxima and vary with volume, endpoint, temperature, battery age and radio conditions. Rechargeable through USB-C. No full-charge time is asserted for the stored revision.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-rev ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eAudio direction and connector roles\u003c\/h4\u003e\n\u003cp\u003eIn TX, audio enters through the attached 3.5mm plug from a TV, airplane seat, computer or gym machine and travels to Bluetooth headphones\/speakers. In RX, phone\/tablet audio arrives by Bluetooth and exits the plug into a car, powered speaker or stereo AUX input.\u003c\/p\u003e\n\u003cp\u003eConnector rule: a source\/output must feed a destination\/input. USB power, USB host data, analogue AUX and Bluetooth radio roles are separate even when one enclosure handles several of them.\u003c\/p\u003e\n\u003cp\u003eStart safely: set the correct mode, select the target input and lower every volume control before testing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eSound, codecs, calls and latency\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eCodecs.\u003c\/b\u003e No codec list is published for the India Bluetooth 5.4 revision. SBC, AAC, aptX, LDAC and LC3 are not asserted beyond whatever compatible endpoints negotiate.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eLatency.\u003c\/b\u003e UGREEN describes reduced latency but gives no number or codec. It is not certified for musical-instrument monitoring and is explicitly listed as incompatible with instruments.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMicrophone and calls.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eReal-world fidelity.\u003c\/b\u003e Source file, negotiated codec, radio conditions, analogue cable, amplifier and speakers\/headphones all affect the result. A newer Bluetooth number is not automatically higher sound quality.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-rev ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eUse scenarios\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eScenario 1.\u003c\/b\u003e Airplane audio to supported Bluetooth headphones.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 2.\u003c\/b\u003e TV listening through one or two compatible headsets.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 3.\u003c\/b\u003e Phone music to a car AUX system.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 4.\u003c\/b\u003e Tablet streaming to an older powered speaker.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 5.\u003c\/b\u003e Portable two-way audio conversion during travel.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-box ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eSetup and usability guidance\u003c\/h4\u003e\n\u003cp\u003eUsability rule: establish one clean path first. Add a second source, listener, output or peripheral only after the first works reliably.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eControls.\u003c\/b\u003e Use the physical TX\/RX switch before pairing; the multifunction control and reset opening handle power, pairing and recovery according to the CM872 manual.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSecond-device behaviour.\u003c\/b\u003e Two Bluetooth devices can connect in TX or RX. TX can share one source with two listeners; RX supports convenient two-source connection, not mixing two songs.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eRecovery.\u003c\/b\u003e Use the marked reset control\/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStep 1: Charge the adapter and select TX or RX.\u003c\/li\u003e\n\u003cli\u003eStep 2: Connect the 3.5mm plug to an output in TX or an AUX input in RX.\u003c\/li\u003e\n\u003cli\u003eStep 3: Pair one Bluetooth endpoint and verify low-volume audio.\u003c\/li\u003e\n\u003cli\u003eStep 4: Add the second endpoint only after the first is stable.\u003c\/li\u003e\n\u003cli\u003eStep 5: On an aircraft, follow crew instructions and ensure the seat socket is a permitted headphone output.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-box ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eCompatible devices and systems\u003c\/h4\u003e\n\u003cp\u003eClass: TVs, airplane entertainment, computers and gym machines with 3.5mm audio output in TX; Bluetooth phones\/tablets plus cars, amplifiers and powered speakers with 3.5mm AUX input in RX.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMatch the operating-system\/audio profile and connector role, not only the Bluetooth logo.\u003c\/li\u003e\n\u003cli\u003eConfirm whether you need programme audio, microphone return, peripheral data or file transfer; these use different profiles.\u003c\/li\u003e\n\u003cli\u003eFor AUX\/RCA products, confirm the destination is a line-level input and already has its own amplifier.\u003c\/li\u003e\n\u003cli\u003eFor PC adapters, verify driver requirements and disable a competing built-in Bluetooth radio.\u003c\/li\u003e\n\u003cli\u003eFor two-way products, confirm that the chosen TX or RX mode matches the wired device.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eWhat this product does\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eSwitches a 3.5mm connection between transmitter input and receiver output roles.\u003c\/li\u003e\n\u003cli\u003ePairs the number of endpoints documented for this SKU.\u003c\/li\u003e\n\u003cli\u003eRuns from its internal rechargeable battery for portable use.\u003c\/li\u003e\n\u003cli\u003eReconnects to saved compatible endpoints when the selected mode matches.\u003c\/li\u003e\n\u003cli\u003eCarries programme audio within the codec and call boundaries stated above.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-rev ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eWhat this product does not do\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003enot compatible with AirPods Pro 2, AirPods 4 or AirPods 4 ANC per UGREEN; not for musical instruments, keyboards, mice, printers, file transfer, optical audio, microphone return or water exposure.\u003c\/li\u003e\n\u003cli\u003eDoes not guarantee uninterrupted wireless service through metal, walls, crowds or heavy 2.4GHz interference.\u003c\/li\u003e\n\u003cli\u003eDoes not repair a damaged source, USB port, AUX socket, amplifier or speaker.\u003c\/li\u003e\n\u003cli\u003eDoes not make a connector compatible merely because it fits physically.\u003c\/li\u003e\n\u003cli\u003eDoes not prove ANC, aptX, LDAC, multipoint or microphone return from the Bluetooth version number alone.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eWhat to do\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eCheck the label.\u003c\/b\u003e Confirm SKU, model and stored revision on the product or box before relying on a specification.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eBegin with one endpoint.\u003c\/b\u003e Pair and test one path before adding any supported second device or output.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eLower volume first.\u003c\/b\u003e Protect hearing and speakers when changing mode, output, codec, call profile or device.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eKeep connections dry.\u003c\/b\u003e Inspect USB and audio plugs, remove debris without metal tools and dry completely before power.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eUse official drivers\/manuals.\u003c\/b\u003e Use the CM\/BT model instructions; related UGREEN revisions can use different buttons and radios.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePause before switching.\u003c\/b\u003e When two sources are connected, pause the current programme before starting the other.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-rev ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eWhat not to do\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eDo not infer features.\u003c\/b\u003e Bluetooth 5.x\/6.0 alone does not establish codec, ANC, microphone, multipoint or delay.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not force plugs.\u003c\/b\u003e Stop if a connector does not align; check port type, direction, damage and case clearance.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not use speaker-level output.\u003c\/b\u003e AUX\/RCA receiver inputs are line-level; passive speakers still need an amplifier.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not pair while moving.\u003c\/b\u003e Configure car and aircraft audio before movement and follow local\/crew instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not charge damaged cells.\u003c\/b\u003e Stop for swelling, leakage, odour or abnormal heat and seek proper battery disposal.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not borrow reset timing.\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eBattery, charging and realistic runtime\u003c\/h4\u003e\n\u003cp\u003eBattery\/power: Up to 18 hours in RX mode and 16 hours in TX mode. Figures are test maxima and vary with volume, endpoint, temperature, battery age and radio conditions.\u003c\/p\u003e\n\u003cp\u003eCharging\/connection: Rechargeable through USB-C. No full-charge time is asserted for the stored revision.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePublished runtime is normally a controlled maximum; volume, calls, codec, temperature, range and battery age can shorten it.\u003c\/li\u003e\n\u003cli\u003eUSB-powered models have no reserve runtime and stop when vehicle\/computer power stops.\u003c\/li\u003e\n\u003cli\u003eUse compliant, undamaged power sources and disconnect any product that becomes unusually hot.\u003c\/li\u003e\n\u003cli\u003eDo not leave rechargeable products empty for months; follow the manual for long-term storage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-rev ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eWarnings and limitations\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHearing: begin at low volume, limit exposure and stop if you notice discomfort or ringing. Bluetooth features and noise processing are not hearing protection.\u003c\/li\u003e\n\u003cli\u003eBattery: never crush, puncture, short, burn or charge a swollen, leaking, wet or unusually hot rechargeable product. USB-powered models still require a sound, compliant 5V source.\u003c\/li\u003e\n\u003cli\u003eAircraft: follow crew instructions, use only permitted headphone outputs and keep wireless devices off whenever directed. Carry lithium products in accordance with airline rules.\u003c\/li\u003e\n\u003cli\u003eDriving: pair, mount, select sources and set volume while parked. Hands-free calling does not remove attention or legal responsibilities.\u003c\/li\u003e\n\u003cli\u003eWater: This product does not has a IP rating. Keep adapters, plugs and charging ports dry; never connect power while damp.\u003c\/li\u003e\n\u003cli\u003eHeat and storage: do not leave the product on a hot dashboard, near a heater or in direct sun. Keep small adapters and cables away from children and pets.\u003c\/li\u003e\n\u003cli\u003eAudio ports: connect only to the stated headphone\/AUX line-level role. Never connect a 3.5mm\/RCA port to mains, passive-speaker output or an unknown industrial signal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eTroubleshooting and reset\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eNo pairing.\u003c\/b\u003e Bring devices close, verify power\/mode, disconnect competing saved devices and pair one endpoint first.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eConnected but silent.\u003c\/b\u003e Check source playback, OS output, TX\/RX direction, AUX input selection, cable seating and both volume controls.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAudio but no microphone.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDrop-outs.\u003c\/b\u003e Reduce distance and metal\/body obstruction, move from crowded 2.4GHz radios and test one connection at a time.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDelay.\u003c\/b\u003e Compare with a wired path; no unstated codec or Bluetooth version can remove all source and endpoint buffering.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eReset path.\u003c\/b\u003e Use the marked reset control\/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ugd-section\" id=\"ugd-specs\"\u003e\n\u003cdiv class=\"ugd-head\"\u003e\n\u003cspan class=\"ugd-eyebrow\"\u003eSpecifications\u003c\/span\u003e\u003ch3\u003eAt a glance.\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdl class=\"ugd-specs\"\u003e\n\u003cdiv\u003e\n\u003cdt\u003eProduct \/ model\u003c\/dt\u003e\n\u003cdd\u003eUGREEN Bluetooth audio receiver\/transmitter \/ CM872\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eSKU \/ colour\u003c\/dt\u003e\n\u003cdd\u003e45812 \/ white\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eBluetooth version\u003c\/dt\u003e\n\u003cdd\u003e5.4, India\/Canada revision\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eModes\u003c\/dt\u003e\n\u003cdd\u003eTX and RX\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eWired interface\u003c\/dt\u003e\n\u003cdd\u003eAttached 3.5mm audio plug\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eDual pairing\u003c\/dt\u003e\n\u003cdd\u003eTwo endpoints in TX or RX\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eRuntime\u003c\/dt\u003e\n\u003cdd\u003eUp to 16h TX \/ 18h RX\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eWorking band\u003c\/dt\u003e\n\u003cdd\u003e2.400–2.4835GHz\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eCharging\u003c\/dt\u003e\n\u003cdd\u003eUSB-C rechargeable\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eCodecs\u003c\/dt\u003e\n\u003cdd\u003eNot published for stored revision\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eMicrophone\/calls\u003c\/dt\u003e\n\u003cdd\u003eNot verified\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eInstrument use\u003c\/dt\u003e\n\u003cdd\u003eExplicitly not compatible\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eAirPods limitation\u003c\/dt\u003e\n\u003cdd\u003ePro 2, 4 and 4 ANC listed unsupported\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eIn the box\u003c\/dt\u003e\n\u003cdd\u003eConfirm this SKU\/revision on the sealed product.\u003cbr\u003eConfirm TX, RX or Windows-host direction.\u003cbr\u003eConfirm every wired input\/output and required power source.\u003cbr\u003eConfirm call\/microphone, codec and second-device needs separately.\u003cbr\u003eCheck whether any cable, charger or flight adapter you require is actually listed.\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003c\/dl\u003e\n\u003cp class=\"ugd-note\"\u003eListed ranges and runtimes are qualified maxima in suitable conditions, not universal guarantees.\u003c\/p\u003e\n\u003cp class=\"ugd-note\"\u003ePackage: CM872 adapter, USB-C charging cable and documentation; confirm the sealed box if a twin-prong airplane adapter is required because media does not show one.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ugd-section\" id=\"ugd-faqs\"\u003e\n\u003cdiv class=\"ugd-head\"\u003e\n\u003cspan class=\"ugd-eyebrow\"\u003eFAQs\u003c\/span\u003e\u003ch3\u003eQuestions buyers ask.\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat exactly is UGREEN 45812?\u003c\/summary\u003e\u003cp\u003eIt is a rechargeable two-way 3.5mm Bluetooth audio adapter for transmitting from wired sources to Bluetooth listeners or receiving phone\/tablet audio on a wired AUX system.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do TX and RX modes differ?\u003c\/summary\u003e\u003cp\u003eIn TX, audio enters through the attached 3.5mm plug from a TV, airplane seat, computer or gym machine and travels to Bluetooth headphones\/speakers. In RX, phone\/tablet audio arrives by Bluetooth and exits the plug into a car, powered speaker or stereo AUX input.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich codecs does SKU 45812 support?\u003c\/summary\u003e\u003cp\u003eNo codec list is published for the India Bluetooth 5.4 revision. SBC, AAC, aptX, LDAC and LC3 are not asserted beyond whatever compatible endpoints negotiate.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs low latency guaranteed?\u003c\/summary\u003e\u003cp\u003eUGREEN describes reduced latency but gives no number or codec. It is not certified for musical-instrument monitoring and is explicitly listed as incompatible with instruments.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDo microphone and calls work?\u003c\/summary\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan two listeners or sources stay connected?\u003c\/summary\u003e\u003cp\u003eTwo Bluetooth devices can connect in TX or RX. TX can share one source with two listeners; RX supports convenient two-source connection, not mixing two songs.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat battery life or power does it use?\u003c\/summary\u003e\u003cp\u003eUp to 18 hours in RX mode and 16 hours in TX mode. Figures are test maxima and vary with volume, endpoint, temperature, battery age and radio conditions. Rechargeable through USB-C. No full-charge time is asserted for the stored revision.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich devices and systems are compatible?\u003c\/summary\u003e\u003cp\u003eTVs, airplane entertainment, computers and gym machines with 3.5mm audio output in TX; Bluetooth phones\/tablets plus cars, amplifiers and powered speakers with 3.5mm AUX input in RX.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat should I do if pairing fails?\u003c\/summary\u003e\u003cp\u003eUse the marked reset control\/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is in the package?\u003c\/summary\u003e\u003cp\u003eCM872 adapter, USB-C charging cable and documentation; confirm the sealed box if a twin-prong airplane adapter is required because media does not show one\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat should it not be used for?\u003c\/summary\u003e\u003cp\u003enot compatible with AirPods Pro 2, AirPods 4 or AirPods 4 ANC per UGREEN; not for musical instruments, keyboards, mice, printers, file transfer, optical audio, microphone return or water exposure.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cscript\u003e(function(){function m(){var s=document.querySelector(\".ugd-story,.ht-story,.ava-story\");if(!s)return;var d=s.closest(\".product-block--description\");var a=document.querySelector(\"article.product--outer\");if(!d||!a||d.closest(\".ugd-fullwrap\"))return;var w=document.createElement(\"div\");w.className=\"ugd-fullwrap\";w.style.cssText=\"max-width:1200px;margin:40px auto 0;padding:0 24px;box-sizing:border-box;width:100%\";w.appendChild(d);a.parentNode.insertBefore(w,a.nextSibling);}if(document.readyState!==\"loading\")m();else document.addEventListener(\"DOMContentLoaded\",m);})();\u003c\/script\u003e","brand":"UGREEN","offers":[{"title":"Default Title","offer_id":44345811566691,"sku":"45812","price":3050.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0581\/3780\/4899\/files\/45812_01.webp?v=1783663093","url":"https:\/\/ugreenindia.com\/products\/ugreen-bluetooth-5-4-transmitter-and-receiver","provider":"Ugreen India","version":"1.0","type":"link"}