The UGREEN Bluetooth 5.4 Transmitter and Receiver (45812) works both ways: as a transmitter it sends audio from a TV, PC or in-flight screen to Bluetooth headphones; as a receiver it adds Bluetooth to a car stereo or speakers. It connects through 3.5mm AUX, and pairs with two devices. Battery: up to 16h TX / 18h RX.
BT 5.4Bluetooth
TX + RX2-in-1
3.5mmaudio
up tobattery
UGREEN Bluetooth Transmitter and Receiver key features
Bluetooth 5.4 Stable, low-power link.
Transmit or receive Works both ways.
3.5mm AUX Audio connection.
Dual pairing Two devices connected.
up to 16h TX / 18h RX Rechargeable.
Low latency For TV and gaming.
UGREEN Bluetooth Transmitter and Receiver highlights
Long battery life
up to 16h TX / 18h RX.
Usage scenarios for the UGREEN Bluetooth Transmitter and Receiver
In the car
Stream music and maps from your phone through the car stereo.
You get
Result
Bluetooth
5.4
Calls
No
Connection
3.5mm AUX
Use: Plug into the AUX port, pair your phone.
TV and travel
Wireless headphones with a TV, console or in-flight screen.
You get
Result
Mode
Transmitter and Receiver
Bluetooth
5.4
Codec
SBC
Use: Connect, then pair.
UGREEN Bluetooth Transmitter and Receiver compatibility
Device
Status
What to expect
Phones, tablets, laptops
Compatible
Bluetooth source
Car stereos, speakers, amplifiers with 3.5mm AUX
Compatible
Wired input
TVs, PCs, consoles, in-flight screens
Compatible
3.5mm AUX
Bluetooth headphones and speakers
Compatible
Receiver side
Works with
Bluetooth phones and headphones
Won't work with
Systems without a matching audio port
UGREEN 45812 (CM872) Bluetooth 5.4 3.5mm AUX Transmitter and Receiver specifications
Model
UGREEN 45812 (CM872)
Bluetooth
5.4
Mode
Transmitter and Receiver
Audio
3.5mm AUX
Battery
up to 16h TX / 18h RX
What's in the box
UGREEN Bluetooth 5.4 3.5mm AUX Transmitter and Receiver (45812)
Good to know
Codec depends on both ends. Advanced codecs works only if your phone or headphones support it too.
Keep within about 10m for a stable link.
UGREEN Bluetooth Transmitter and Receiver FAQs
How do I pair it?
Turn it on, then select it in your phone's Bluetooth list.
Can it work on a plane?
Yes, in TX mode with the in-flight 3.5mm jack.
Can two devices connect?
Yes, two at a time.
How long does the battery last?
up to 16h TX / 18h RX.
Genuine UGREEN, imported and sold by Sophus Technosol Pvt Ltd, the authorised national distributor. GST invoice with every order. 2-year India warranty.
The UGREEN Bluetooth 5.4 Transmitter and Receiver (45812) works both ways: as a transmitter it sends audio from a TV, PC or in-flight screen to Bluetooth headphones; as a receiver it adds Bluetooth to a car stereo or speakers. It connects through 3.5mm AUX, and pairs with two devices. Battery: up to 16h TX / 18h RX.
BT 5.4Bluetooth
TX + RX2-in-1
3.5mmaudio
up tobattery
UGREEN Bluetooth Transmitter and Receiver key features
Bluetooth 5.4 Stable, low-power link.
Transmit or receive Works both ways.
3.5mm AUX Audio connection.
Dual pairing Two devices connected.
up to 16h TX / 18h RX Rechargeable.
Low latency For TV and gaming.
UGREEN Bluetooth Transmitter and Receiver highlights
Long battery life
up to 16h TX / 18h RX.
Usage scenarios for the UGREEN Bluetooth Transmitter and Receiver
In the car
Stream music and maps from your phone through the car stereo.
You get
Result
Bluetooth
5.4
Calls
No
Connection
3.5mm AUX
Use: Plug into the AUX port, pair your phone.
TV and travel
Wireless headphones with a TV, console or in-flight screen.
You get
Result
Mode
Transmitter and Receiver
Bluetooth
5.4
Codec
SBC
Use: Connect, then pair.
UGREEN Bluetooth Transmitter and Receiver compatibility
Device
Status
What to expect
Phones, tablets, laptops
Compatible
Bluetooth source
Car stereos, speakers, amplifiers with 3.5mm AUX
Compatible
Wired input
TVs, PCs, consoles, in-flight screens
Compatible
3.5mm AUX
Bluetooth headphones and speakers
Compatible
Receiver side
Works with
Bluetooth phones and headphones
Won't work with
Systems without a matching audio port
UGREEN 45812 (CM872) Bluetooth 5.4 3.5mm AUX Transmitter and Receiver specifications
Model
UGREEN 45812 (CM872)
Bluetooth
5.4
Mode
Transmitter and Receiver
Audio
3.5mm AUX
Battery
up to 16h TX / 18h RX
What's in the box
UGREEN Bluetooth 5.4 3.5mm AUX Transmitter and Receiver (45812)
Good to know
Codec depends on both ends. Advanced codecs works only if your phone or headphones support it too.
Keep within about 10m for a stable link.
UGREEN Bluetooth Transmitter and Receiver FAQs
How do I pair it?
Turn it on, then select it in your phone's Bluetooth list.
Can it work on a plane?
Yes, in TX mode with the in-flight 3.5mm jack.
Can two devices connect?
Yes, two at a time.
How long does the battery last?
up to 16h TX / 18h RX.
Genuine UGREEN, imported and sold by Sophus Technosol Pvt Ltd, the authorised national distributor. GST invoice with every order. 2-year India warranty.
GST Invoice available, just mail back with details to order confirmation mail.
Buy direct from official UGREEN India
GST Invoice, Warranty, authenticity, faster support
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UGREEN
UGREEN 45812 CM872 Bluetooth 5.4 TX/RX Audio Adapter
Sale priceRs. 3,079.00
Regular priceRs. 5,159.00
Unit price
Overview
CM872 • 3.5MM TX/RX • DUAL PAIRING
Bluetooth 5.4
SKU 45812
CM872
TX + RX
5.4Bluetooth version
TX and RXModes
Up to 16h TX / 18h RXRuntime
2.400–2.4835GHzWorking band
Features
What it does well.
Key features
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 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 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.
Sound, codecs, calls and latency
Codecs. 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.
Latency. 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.
Microphone and calls.
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.
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.
Setup and usability guidance
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.
Step 1: Charge the adapter and select TX or RX.
Step 2: Connect the 3.5mm plug to an output in TX or an AUX input in RX.
Step 3: Pair one Bluetooth endpoint and verify low-volume audio.
Step 4: Add the second endpoint only after the first is stable.
Step 5: On an aircraft, follow crew instructions and ensure the seat socket is a permitted headphone output.
Compatible devices and systems
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.
What this product does
Switches a 3.5mm connection between transmitter input and receiver output roles.
Pairs the 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 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, 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 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.
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 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 manual for long-term storage.
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: This product does not has a 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.
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.
Reset path. Use the marked reset control/manual sequence after forgetting saved pairings. Re-pair one endpoint at close range before restoring a second.
Specifications
At a glance.
Product / model
UGREEN Bluetooth audio receiver/transmitter / CM872
SKU / colour
45812 / white
Bluetooth version
5.4, 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 stored revision
Microphone/calls
Not verified
Instrument use
Explicitly not compatible
AirPods limitation
Pro 2, 4 and 4 ANC listed unsupported
In the box
Confirm this 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.
Listed ranges and runtimes are qualified maxima in suitable conditions, not universal guarantees.
Package: 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.
FAQs
Questions buyers ask.
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 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 number or codec. It is not certified for musical-instrument monitoring and is explicitly listed as incompatible with instruments.
Do microphone and calls work?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 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 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, microphone return or water exposure.
