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UGREEN 45812 CM872 Bluetooth 5.4 TX/RX Audio Adapter

Rs. 4,110.00 Rs. 5,159.00
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CM872 • 3.5MM TX/RX • DUAL PAIRING

UGREEN 45812 CM872 Bluetooth 5.4 TX/RX Audio Adapter

Overview

UGREEN 45812 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. This shopper guide reconciles the exact live media with UGREEN-owned sources so direction, version, codec, call, battery and compatibility claims stay revision-specific.

Bluetooth 5.4SKU 45812CM872TX + RX
UGREEN 45812 UGREEN 45812 transmitter-receiver product view
UGREEN 45812 transmitter-receiver product view

Key features

Exact role

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.

Audio path

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.

Codec boundary

No exact 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.

Power design

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 exact full-charge time is asserted for the stored revision.

Audio direction and connector roles

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.

Connector 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.

Start safely: set the correct mode, select the target input and lower every volume control before testing.

UGREEN 45812 Supported transmitter source and destination map
Supported transmitter source and destination map

Sound, codecs, calls and latency

Codecs

No exact 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.

Latency

UGREEN describes reduced latency but gives no exact number or codec. It is not certified for musical-instrument monitoring and is explicitly listed as incompatible with instruments.

Microphone and calls

No microphone or call-return function is verified in the exact live record. Treat it as programme-audio TX/RX, not a headset voice-chat bridge.

Real-world fidelity

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.

UGREEN 45812 Two-listener television transmitter scenario
Two-listener television transmitter scenario

Use scenarios

Scenario 1

Airplane audio to supported Bluetooth headphones.

Scenario 2

TV listening through one or two compatible headsets.

Scenario 3

Phone music to a car AUX system.

Scenario 4

Tablet streaming to an older powered speaker.

Scenario 5

Portable two-way audio conversion during travel.

UGREEN 45812 Airline-seat transmitter use scenario
Airline-seat transmitter use scenario

Setup and usability guidance

  1. Step 1: Charge the adapter and select TX or RX.
  2. Step 2: Connect the 3.5mm plug to an output in TX or an AUX input in RX.
  3. Step 3: Pair one Bluetooth endpoint and verify low-volume audio.
  4. Step 4: Add the second endpoint only after the first is stable.
  5. Step 5: On an aircraft, follow crew instructions and ensure the seat socket is a permitted headphone output.

Usability rule: establish one clean path first. Add a second source, listener, output or peripheral only after the first works reliably.

Controls

Use the physical TX/RX switch before pairing; the multifunction control and reset opening handle power, pairing and recovery according to the CM872 manual.

Second-device behaviour

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.

Recovery

Use the marked reset control/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.

UGREEN 45812 Receiver-mode two-phone car scenario
Receiver-mode two-phone car scenario

Compatible devices and systems

Verified class: 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.

  • Match the operating-system/audio profile and connector role, not only the Bluetooth logo.
  • Confirm whether you need programme audio, microphone return, peripheral data or file transfer; these use different profiles.
  • For AUX/RCA products, confirm the destination is a line-level input and already has its own amplifier.
  • For PC adapters, verify driver requirements and disable a competing built-in Bluetooth radio.
  • For two-way products, confirm that the chosen TX or RX mode matches the wired device.
UGREEN 45812 Receiver-mode powered-speaker use scenario
Receiver-mode powered-speaker use scenario

What this product does

  • Switches a 3.5mm connection between transmitter input and receiver output roles.
  • Pairs the exact number of endpoints documented for this SKU.
  • Runs from its internal rechargeable battery for portable use.
  • Reconnects to saved compatible endpoints when the selected mode matches.
  • Carries programme audio within the exact codec and call boundaries stated above.

What this product does not do

  • not compatible with AirPods Pro 2, AirPods 4 or AirPods 4 ANC per UGREEN; not for musical instruments, keyboards, mice, printers, file transfer, optical audio, verified microphone return or water exposure.
  • Does not guarantee uninterrupted wireless service through metal, walls, crowds or heavy 2.4GHz interference.
  • Does not repair a damaged source, USB port, AUX socket, amplifier or speaker.
  • Does not make a connector compatible merely because it fits physically.
  • Does not prove ANC, aptX, LDAC, multipoint or microphone return from the Bluetooth version number alone.

What to do

Check the label

Confirm SKU, model and stored revision on the product or box before relying on a specification.

Begin with one endpoint

Pair and test one path before adding any supported second device or output.

Lower volume first

Protect hearing and speakers when changing mode, output, codec, call profile or device.

Keep connections dry

Inspect USB and audio plugs, remove debris without metal tools and dry completely before power.

Use official drivers/manuals

Use the exact CM/BT model instructions; related UGREEN revisions can use different buttons and radios.

Pause before switching

When two sources are connected, pause the current programme before starting the other.

What not to do

Do not infer features

Bluetooth 5.x/6.0 alone does not establish codec, ANC, microphone, multipoint or delay.

Do not force plugs

Stop if a connector does not align; check port type, direction, damage and case clearance.

Do not use speaker-level output

AUX/RCA receiver inputs are line-level; passive speakers still need an amplifier.

Do not pair while moving

Configure car and aircraft audio before movement and follow local/crew instructions.

Do not charge damaged cells

Stop for swelling, leakage, odour or abnormal heat and seek proper battery disposal.

Do not borrow reset timing

Sibling models and revisions often use different hold durations and indicators.

Battery, charging and realistic runtime

Battery/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.

Charging/connection: Rechargeable through USB-C. No exact full-charge time is asserted for the stored revision.

  • Published runtime is normally a controlled maximum; volume, calls, codec, temperature, range and battery age can shorten it.
  • USB-powered models have no reserve runtime and stop when vehicle/computer power stops.
  • Use compliant, undamaged power sources and disconnect any product that becomes unusually hot.
  • Do not leave rechargeable products empty for months; follow the exact manual for long-term storage.
UGREEN 45812 Up to 18-hour battery guide
Up to 18-hour battery guide

Warnings and limitations

  • Hearing: begin at low volume, limit exposure and stop if you notice discomfort or ringing. Bluetooth features and noise processing are not hearing protection.
  • Battery: 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.
  • Aircraft: follow crew instructions, use only permitted headphone outputs and keep wireless devices off whenever directed. Carry lithium products in accordance with airline rules.
  • Driving: pair, mount, select sources and set volume while parked. Hands-free calling does not remove attention or legal responsibilities.
  • Water: no exact product here has a verified IP rating. Keep adapters, plugs and charging ports dry; never connect power while damp.
  • Heat 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.
  • Audio 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.

Troubleshooting and reset

No pairing

Bring devices close, verify power/mode, disconnect competing saved devices and pair one endpoint first.

Connected but silent

Check source playback, OS output, TX/RX direction, AUX input selection, cable seating and both volume controls.

Audio but no microphone

No microphone or call-return function is verified in the exact live record. Treat it as programme-audio TX/RX, not a headset voice-chat bridge. Confirm the call app input and permissions only where a microphone path is documented.

Drop-outs

Reduce distance and metal/body obstruction, move from crowded 2.4GHz radios and test one connection at a time.

Delay

Compare with a wired path; no unstated codec or Bluetooth version can remove all source and endpoint buffering.

Exact reset path

Use the marked reset control/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.

Technical specifications

Product / model UGREEN Bluetooth audio receiver/transmitter / CM872
SKU / colour 45812 / white
Bluetooth version 5.4, exact India/Canada revision
Modes TX and RX
Wired interface Attached 3.5mm audio plug
Dual pairing Two endpoints in TX or RX
Runtime Up to 16h TX / 18h RX
Working band 2.400–2.4835GHz
Charging USB-C rechargeable
Codecs Not published for exact stored revision
Microphone/calls Not verified
Instrument use Explicitly not compatible
AirPods limitation Pro 2, 4 and 4 ANC listed unsupported

Listed ranges and runtimes are qualified maxima in suitable conditions, not universal guarantees.

Package contents

Package: CM872 adapter, USB-C charging cable and documentation; confirm the sealed box if a twin-prong airplane adapter is required because exact media does not show one.

Pre-purchase checklist

  • Confirm the exact SKU/revision on the sealed product.
  • Confirm TX, RX or Windows-host direction.
  • Confirm every wired input/output and required power source.
  • Confirm call/microphone, codec and second-device needs separately.
  • Check whether any cable, charger or flight adapter you require is actually listed.

Product-specific FAQ

What exactly is UGREEN 45812?

It 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.

How do TX and RX modes differ?

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.

Which codecs does SKU 45812 support?

No exact 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.

Is low latency guaranteed?

UGREEN describes reduced latency but gives no exact number or codec. It is not certified for musical-instrument monitoring and is explicitly listed as incompatible with instruments.

Do microphone and calls work?

No microphone or call-return function is verified in the exact live record. Treat it as programme-audio TX/RX, not a headset voice-chat bridge.

Can two listeners or sources stay connected?

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.

What battery life or power does it use?

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 exact full-charge time is asserted for the stored revision.

Which devices and systems are compatible?

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.

What should I do if pairing fails?

Use the marked reset control/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.

What is in the package?

CM872 adapter, USB-C charging cable and documentation; confirm the sealed box if a twin-prong airplane adapter is required because exact media does not show one

What should it not be used for?

not compatible with AirPods Pro 2, AirPods 4 or AirPods 4 ANC per UGREEN; not for musical instruments, keyboards, mice, printers, file transfer, optical audio, verified microphone return or water exposure.

Exact-SKU research and media reconciliation

Research method: exact live Shopify status, description and every stored image were compared with exact-SKU UGREEN regional pages, UGREEN manuals/support and model mappings. Sibling and later-revision features were excluded when they conflicted.

Media decision: Exact India media and the exact UGREEN Canada page support the Bluetooth 5.4 white CM872 revision, TX/RX direction, dual pairing and 16h TX/18h RX. A separate UGREEN Australia Bluetooth 6.0 revision was rejected; no codec or microphone claim was imported.

Source records: UGREEN source 1 · UGREEN source 2

UGREEN 45812 Rear housing and regulatory-label view
Rear housing and regulatory-label view

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