{"product_id":"ugreen-bluetooth-transmitter-receiver-with-aptx-32h-long-playtime-dual-connection-mic-for-calls-2-in-1-bluetooth-adapter-for-airplane-car-tv-headphone-airpods-speaker-45492","title":"UGREEN 45492 BT503 Bluetooth 5.3 Transmitter\/Receiver","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; 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}\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\u003cp\u003eUGREEN 45492 is a rechargeable 3.5mm Bluetooth 5.3 transmitter\/receiver with screen, physical controls, dual pairing and different codec sets for TX and RX. Below: direction, pairing, codec limits, microphone behaviour, battery expectations and safe use without borrowing claims from similar UGREEN products.\u003c\/p\u003e\n\u003cul class=\"ugd-chips\"\u003e\n\u003cli\u003eBT503 • DISPLAY • BLUETOOTH 5.3 • TX\/RX\u003c\/li\u003e\n\u003cli\u003eSKU 45492\u003c\/li\u003e\n\u003cli\u003eBT503\u003c\/li\u003e\n\u003cli\u003eBlack\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\u003e5.3\u003c\/b\u003e\u003cspan\u003eBluetooth version\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eA2DP\u003c\/b\u003e\u003cspan\u003eProfiles\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e3.5mm\u003c\/b\u003e\u003cspan\u003eAudio connector\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eSBC\u003c\/b\u003e\u003cspan\u003eTX codecs\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\u003eWhat it does.\u003c\/b\u003e a rechargeable 3.5mm Bluetooth 5.3 transmitter\/receiver with screen, physical controls, dual pairing and different codec sets for TX and RX.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAudio direction.\u003c\/b\u003e TX: analogue audio enters the 3.5mm lead and is transmitted to Bluetooth headphones\/speakers. RX: a phone\/tablet transmits Bluetooth audio to BT503, which outputs analogue sound through the same 3.5mm lead to AUX equipment.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCodec boundary.\u003c\/b\u003e TX: SBC, aptX, aptX HD and aptX Adaptive. RX: SBC, AAC, aptX and aptX HD. Both endpoints must support a codec or they negotiate a common alternative. LDAC is not listed.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCompatibility boundary.\u003c\/b\u003e 3.5mm analogue outputs in TX and 3.5mm analogue inputs in RX; Bluetooth headphones, earbuds, speakers, phones, tablets and computers supporting a common listed codec. media excludes AirPods Pro 2, AirPods 4 and musical instruments.\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: source → product → listener\u003c\/h4\u003e\n\u003cp\u003eTX: analogue audio enters the 3.5mm lead and is transmitted to Bluetooth headphones\/speakers. RX: a phone\/tablet transmits Bluetooth audio to BT503, which outputs analogue sound through the same 3.5mm lead to AUX equipment.\u003c\/p\u003e\n\u003cp\u003eWhy direction matters: transmitter, receiver and headset roles are not interchangeable. A Bluetooth version number also does not establish microphone return, codec, multipoint or low latency.\u003c\/p\u003e\n\u003cp\u003eBefore pairing: identify the wired input\/output, set the correct operating mode and lower volume at every powered endpoint.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"ugd-feature ugd-noimg\"\u003e\u003cdiv\u003e\n\u003ch4\u003eSound, codecs and latency\u003c\/h4\u003e\n\u003cp\u003e\u003cb\u003eCodec support.\u003c\/b\u003e TX: SBC, aptX, aptX HD and aptX Adaptive. RX: SBC, AAC, aptX and aptX HD. Both endpoints must support a codec or they negotiate a common alternative. LDAC is not listed.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDelay and sync.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eReal-world sound.\u003c\/b\u003e Final fidelity depends on the source file, negotiated codec, RF conditions, transducers, fit, amplifier and volume. “Bluetooth 5.x” alone is not a sound-quality tier.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFor games and video.\u003c\/b\u003e Treat every millisecond figure as a controlled test result. Wireless display processing, game engines and headset buffering can add delay.\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 Aircraft or gym 3.5mm output to Bluetooth headphones.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 2.\u003c\/b\u003e TV headphone output to one or two compatible listeners.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 3.\u003c\/b\u003e Phone music to a car or home AUX input.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 4.\u003c\/b\u003e RX-mode hands-free calls using the adapter microphone.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eScenario 5.\u003c\/b\u003e Codec and battery monitoring through the built-in screen.\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\u003eBest practice: pair one endpoint first, verify stable audio, then add any supported second endpoint. This makes faults easier to isolate.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eControls.\u003c\/b\u003e Display shows mode, codec, battery, connected-device names and a 16-level volume indication. Buttons support menu navigation, pairing\/play control and RX volume\/track functions as documented.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMicrophone and calls.\u003c\/b\u003e Built-in microphone and HSP\/HFP profiles support calls in RX use. In TX mode it should not be treated as a console\/TV headset-microphone return path.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTwo-device behaviour.\u003c\/b\u003e Dual pairing is shown. The display identifies connected devices; two-device connection does not mean mixing two source streams or independent volume for two listeners.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eReset path.\u003c\/b\u003e Clear saved pairings using the BT503 menu\/manual sequence, forget BT503 on source devices and restart both endpoints. Do not infer the 80893 ten-second reset sequence for this model.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eStep 1: Charge the BT503 and set TX or RX before connecting.\u003c\/li\u003e\n\u003cli\u003eStep 2: TX: connect the 3.5mm lead to a source output, put the listening device in pairing mode and confirm its name on screen.\u003c\/li\u003e\n\u003cli\u003eStep 3: RX: connect to an AUX input and select BT503 from the phone\/tablet Bluetooth menu.\u003c\/li\u003e\n\u003cli\u003eStep 4: Pair a second device through the documented dual-pair sequence and verify both names.\u003c\/li\u003e\n\u003cli\u003eStep 5: Check the displayed codec rather than assuming the highest codec is active.\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\u003eCompatibility class: 3.5mm analogue outputs in TX and 3.5mm analogue inputs in RX; Bluetooth headphones, earbuds, speakers, phones, tablets and computers supporting a common listed codec. media excludes AirPods Pro 2, AirPods 4 and musical instruments.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMatch Bluetooth audio capability, not just the word Bluetooth. Some TVs, consoles and computers support controllers or data but not Bluetooth audio.\u003c\/li\u003e\n\u003cli\u003eConfirm whether the desired direction is sending audio, receiving audio or returning a microphone. These are separate capabilities.\u003c\/li\u003e\n\u003cli\u003eConfirm physical connector role and audio type: analogue AUX, optical PCM or USB audio are not interchangeable.\u003c\/li\u003e\n\u003cli\u003eUpdate the host operating system and test with other saved Bluetooth devices temporarily disconnected.\u003c\/li\u003e\n\u003cli\u003eWhen using branded earbuds\/headphones, check their pairing limits and supported codec list too.\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 between Bluetooth transmitter and receiver roles.\u003c\/li\u003e\n\u003cli\u003eUses the documented wired audio interface as input in TX and output in RX.\u003c\/li\u003e\n\u003cli\u003eSupports the dual-pair and call behaviour stated above.\u003c\/li\u003e\n\u003cli\u003eRuns from its rechargeable battery for portable use.\u003c\/li\u003e\n\u003cli\u003eReconnects to saved devices when mode and endpoint are available.\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 optical; not USB audio; not LDAC; not a professional instrument transmitter; not confirmed for AirPods Pro 2\/AirPods 4; does not return a Bluetooth-headset microphone in TX mode.\u003c\/li\u003e\n\u003cli\u003eDoes not guarantee uninterrupted wireless service through walls, crowds, RF congestion or defective device ports.\u003c\/li\u003e\n\u003cli\u003eDoes not improve a poor recording, repair a damaged socket or guarantee a particular listening volume.\u003c\/li\u003e\n\u003cli\u003eDoes not mix two independent programmes or create independent listener volume unless expressly documented.\u003c\/li\u003e\n\u003cli\u003eDoes not prove compatibility merely because a connector fits or a device advertises Bluetooth.\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\u003eStart with one device.\u003c\/b\u003e Pair and test one endpoint before adding a supported second device or extra cable path.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eKeep volume low.\u003c\/b\u003e Begin at low source and destination volume, especially after switching RX\/TX, ANC modes or audio outputs.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eKeep firmware and OS current.\u003c\/b\u003e Updates can improve Bluetooth stability, but use only official vendor updates and do not assume they add unlisted hardware features.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eProtect ports and batteries.\u003c\/b\u003e Grip connectors by housings, keep charging contacts dry and store the product away from loose metal objects.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eConfirm active codec or mode.\u003c\/b\u003e Use the host menu or product display when available. Marketing names do not prove what was negotiated.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDry before charging.\u003c\/b\u003e After sweat or a splash, wipe and air-dry completely before returning earbuds to a case or connecting USB power.\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 assume version = feature.\u003c\/b\u003e Bluetooth 5.x does not automatically mean aptX, LDAC, ANC, multipoint or microphone return.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not force connectors.\u003c\/b\u003e Stop if a plug does not align or fully seat; check direction, port type, case clearance and debris.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not charge wet hardware.\u003c\/b\u003e Moisture plus charging contacts can cause corrosion, heat or failure.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not use ANC as protection.\u003c\/b\u003e Noise cancellation does not certify safe exposure in factories, workshops, shooting, aviation or other hazardous noise.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not pair while driving.\u003c\/b\u003e Configure calls, volume and source switching only while safely parked.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDo not invent reset gestures.\u003c\/b\u003e Use this model manual; similar HiTune and Bluetooth adapters use different button timing.\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\u003eRuntime: media states up to 28 hours TX and 32 hours RX; about 2 hours charging. Figures are UGREEN lab results and vary by codec, volume, display use and signal conditions.\u003c\/p\u003e\n\u003cp\u003ePower method: USB-C, limited charging voltage listed as 5.25V. Use a standard 5V USB source and avoid heat or moisture.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePublished runtime is normally measured under controlled conditions; high volume, ANC, premium codecs, calls, displays, cold weather and weak signal can shorten it.\u003c\/li\u003e\n\u003cli\u003eLithium batteries age. Lower runtime after repeated cycles is normal; swelling, leakage, excessive heat or odour is not.\u003c\/li\u003e\n\u003cli\u003eUse compliant cables and power sources, keep ventilation clear and disconnect if the product becomes unusually hot.\u003c\/li\u003e\n\u003cli\u003eFor long storage, avoid leaving the battery empty for months; recharge periodically according to the supplied manual.\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: start at low volume, take listening breaks and reduce level if you notice discomfort or ringing. ANC is not hearing protection.\u003c\/li\u003e\n\u003cli\u003eSituational awareness: do not use isolating audio or ANC where hearing traffic, alarms, announcements or instructions is important.\u003c\/li\u003e\n\u003cli\u003eBattery: do not crush, puncture, burn, short, disassemble or charge a wet\/swollen\/hot product. Stop use if odour, leakage or deformation appears.\u003c\/li\u003e\n\u003cli\u003eChildren and pets: keep earbuds, tips, adapters and cables away from small children; small components can be a choking hazard.\u003c\/li\u003e\n\u003cli\u003eAircraft: follow crew instructions, use only permitted seat audio sockets and keep wireless functions off whenever required.\u003c\/li\u003e\n\u003cli\u003eDriving: pair and adjust while parked. Hands-free capability does not remove attention or legal obligations.\u003c\/li\u003e\n\u003cli\u003eConnections: use only low-level headphone\/AUX or stated optical\/USB interfaces. Do not connect analogue audio ports to mains, speaker-level or unknown industrial signals.\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 Move endpoints close together, charge\/power both, disconnect competing saved devices, verify TX\/RX direction and restart pairing.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAudio but no microphone.\u003c\/b\u003e Confirm RX mode and the built-in-microphone call path; TX mode does not return a headset microphone.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDrop-outs.\u003c\/b\u003e Reduce distance, remove body\/metal obstruction, move away from crowded 2.4GHz sources and test one paired device at a time.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDelay.\u003c\/b\u003e Use a low-latency mode only where listed, confirm both endpoints support the needed codec and compare with a wired path.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eOnly one side\/listener.\u003c\/b\u003e Test the first endpoint alone, then pair the second using the model-specific dual-pair sequence.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eModel-specific reset.\u003c\/b\u003e Clear saved pairings using the BT503 menu\/manual sequence, forget BT503 on source devices and restart both endpoints. Do not infer the 80893 ten-second reset sequence for this model.\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\u003eModel \/ SKU\u003c\/dt\u003e\n\u003cdd\u003eBT503 \/ 45492\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eBluetooth version\u003c\/dt\u003e\n\u003cdd\u003e5.3\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eProfiles\u003c\/dt\u003e\n\u003cdd\u003eA2DP, AVRCP, HSP and HFP\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eAudio connector\u003c\/dt\u003e\n\u003cdd\u003e3.5mm\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eTX codecs\u003c\/dt\u003e\n\u003cdd\u003eSBC, aptX, aptX HD, aptX Adaptive\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eRX codecs\u003c\/dt\u003e\n\u003cdd\u003eSBC, AAC, aptX, aptX HD\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eRange\u003c\/dt\u003e\n\u003cdd\u003eUp to 10m \/ 33ft unobstructed\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eBattery\u003c\/dt\u003e\n\u003cdd\u003e300mAh, 3.7V, 1.11Wh polymer lithium-ion\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eRuntime\u003c\/dt\u003e\n\u003cdd\u003eUp to 28h TX \/ 32h RX\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eCharging\u003c\/dt\u003e\n\u003cdd\u003eUSB-C; about 2h\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eFrequency response\u003c\/dt\u003e\n\u003cdd\u003e20Hz–20kHz listed\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eTHD+N\u003c\/dt\u003e\n\u003cdd\u003e≤0.1% listed\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eRF band \/ max power\u003c\/dt\u003e\n\u003cdd\u003e2400–2483.5MHz \/ 4dBm EIRP\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eDisplay\u003c\/dt\u003e\n\u003cdd\u003eMode, codec, devices, battery and volume\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdt\u003eIn the box\u003c\/dt\u003e\n\u003cdd\u003eConfirm SKU on the product\/box rather than buying by family name alone.\u003cbr\u003eConfirm transmitter versus receiver direction and every wired connector.\u003cbr\u003eConfirm microphone\/call need, desired codec and simultaneous-device need separately.\u003cbr\u003eCheck whether the source device supports Bluetooth audio, not only Bluetooth peripherals.\u003cbr\u003eInspect the sealed package on arrival and retain the manual for the correct reset and control map.\u003c\/dd\u003e\n\u003c\/div\u003e\n\u003c\/dl\u003e\n\u003cp class=\"ugd-note\"\u003eNumbers are model listing or exact-media figures unless marked unverified. They are qualified laboratory maxima, not universal guarantees.\u003c\/p\u003e\n\u003cp class=\"ugd-note\"\u003ePackage: UGREEN BT503\/45492 adapter with attached 3.5mm lead and USB-A-to-USB-C charging cable, as shown in hero media; no extra RCA or optical cable is assumed.\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 45492?\u003c\/summary\u003e\u003cp\u003eIt is a rechargeable 3.5mm Bluetooth 5.3 transmitter\/receiver with screen, physical controls, dual pairing and different codec sets for TX and RX.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the difference between TX and RX mode?\u003c\/summary\u003e\u003cp\u003eTX: analogue audio enters the 3.5mm lead and is transmitted to Bluetooth headphones\/speakers. RX: a phone\/tablet transmits Bluetooth audio to BT503, which outputs analogue sound through the same 3.5mm lead to AUX equipment.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich codecs are supported?\u003c\/summary\u003e\u003cp\u003eTX: SBC, aptX, aptX HD and aptX Adaptive. RX: SBC, AAC, aptX and aptX HD. Both endpoints must support a codec or they negotiate a common alternative. LDAC is not listed.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs there a guaranteed low-latency mode?\u003c\/summary\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDo calls and the microphone work?\u003c\/summary\u003e\u003cp\u003eBuilt-in microphone and HSP\/HFP profiles support calls in RX use. In TX mode it should not be treated as a console\/TV headset-microphone return path.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan TX or RX mode use two Bluetooth devices at once?\u003c\/summary\u003e\u003cp\u003eDual pairing is shown. The display identifies connected devices; two-device connection does not mean mixing two source streams or independent volume for two listeners.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat battery life should I expect?\u003c\/summary\u003e\u003cp\u003emedia states up to 28 hours TX and 32 hours RX; about 2 hours charging. Figures are UGREEN lab results and vary by codec, volume, display use and signal conditions.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow is it charged or powered?\u003c\/summary\u003e\u003cp\u003eUSB-C, limited charging voltage listed as 5.25V. Use a standard 5V USB source and avoid heat or moisture.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich devices are compatible?\u003c\/summary\u003e\u003cp\u003e3.5mm analogue outputs in TX and 3.5mm analogue inputs in RX; Bluetooth headphones, earbuds, speakers, phones, tablets and computers supporting a common listed codec. media excludes AirPods Pro 2, AirPods 4 and musical instruments.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat should I do if pairing fails?\u003c\/summary\u003e\u003cp\u003eClear saved pairings using the BT503 menu\/manual sequence, forget BT503 on source devices and restart both endpoints. Do not infer the 80893 ten-second reset sequence for this model.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is included?\u003c\/summary\u003e\u003cp\u003eUGREEN BT503\/45492 adapter with attached 3.5mm lead and USB-A-to-USB-C charging cable, as shown in hero media; no extra RCA or optical cable is assumed\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":43606032023651,"sku":"45492","price":5649.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0581\/3780\/4899\/files\/45492_01.jpg?v=1763835087","url":"https:\/\/ugreenindia.com\/hi\/products\/ugreen-bluetooth-transmitter-receiver-with-aptx-32h-long-playtime-dual-connection-mic-for-calls-2-in-1-bluetooth-adapter-for-airplane-car-tv-headphone-airpods-speaker-45492","provider":"Ugreen India","version":"1.0","type":"link"}