(B) Launch mode use: A red LED flashes to indicate that it has switched to transmit mode. In the launch mode, the product will automatically search for other Bluetooth receiving devices that have been turned on (such as Bluetooth headset, Bluetooth speaker, Bluetooth receiver, etc.).
eBay
1-10PCS Bluetooth Audio Receiver Board Bluetooth 5.1 MP3 Lossless Decoder Micro USB 3.5mm Audio
Aliexpress UK
Bt transmitter receiver: ① Transmitter mode - transmits audio from non-Bt audio sources (TV, computer, CD/DVD player, etc.) to Bt headphones/speakers via 3.5mm audio cable. (Only audio can be transferred, not video or files).
eBay
Bluetooth Audio Adapter Bluetooth USB Receiving Transmitter 2 in 1 Audio Transmitter Receiver
Aliexpress UK
[Three-in-one design]: Support Bluetooth receiving (RX), Bluetooth transmitter (TX), FM transmitter mode. Equipped with HD LED display, working status and Bluetooth mode can be clearly seen. With multi-function keys, one - click switch mode, or play/pause music, easy to operate. Support wireless music listening, hands-free calling, navigation, make your driving safer [Hi-Fi surround sound]: Built-in new generation Bluetooth 5.1 chip, stable and fast transmission, reject lag lag. Equipped with DSP digital audio processor chip, can manually adjust the treble and bass, make the sound clearer, enhance the surround sound, equipped with aptX lossless transmission technology and intelligent noise reduction system, audio details more dynamic [Remote wireless connection]: Bluetooth receiver adopts.
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Nobsound A5 PRO TPA3255 Bluetooth Receiver Digital Amplifier HiFi Class D Amp Stereo Audio Amplifier
Aliexpress UK
The 2in1 Bluetooth transmitter receiver adapter is small, but has got powerful wireless audio streaming capabilities. 1x 2in1 Bluetooth Audio Transmitter/Receiver Adapter. - Switch between transmitter and receiver modes with the simple flick of a switch.
eBay
Bluetooth 5.4 Car Kit AUX Audio Receiver USB To 3.5mm Hifi Stereo Music Navigation Handsfree With
Aliexpress UK
Function: three in one audio receiver transmitter. Transmitter mode: red LED lights up. 1 5.0 Bluetooth receiver transmitter. Insert one end of the 3.5MM audio cable into the AUX connector of the adapter, and the other end into the audio output hole of the TV, projector, tablet, MP3, CD player and other devices or the RCA audio signal output hole of the TV;.
eBay
KN318 Bluetooth 5.1 Audio Receiver Dual Output AUX USB Stereo Car Hands-Free Call Wireless Adapter
Aliexpress UK
Bluetooth 5.3 stable transmission, the new upgrade Bluetooth 5.3 chip, more stable multi-data transmission, wireless coverage; Bluetooth 5.3. AUX output mode: support devices with 3.5mm (aux) audio interface.
eBay
3 IN 1 Wireless Bluetooth Adapter Transmitter Receiver 3.5mm AUX USB Dongle Audio Adapter For Car
Aliexpress UK
Upgrade your in-car audio experience with thispremium Bluetooth FM Transmitter – the ultimate solution forwireless music playback ,hands-free calling, andfast charging, all in one compact, stylish device.
eBay
KMIND Car Module Bluetooth Audio Adapter Wireless Music Receiver 3.5mm Aux Connection USB Support
Aliexpress UK
NFC Wireless Bluetooth 5.2 Transmitter Receiver Adapter Audio 3.5mm Jack Aux New. LCD USB Bluetooth 5.3 Audio Transmitter Receiver 3.5MM AUX RCA Wireless Adapter. Bluetooth 5.1 Receiver Transmitter 3.5mm AUX RCA USB For TV Stereo Audio Adapter.
eBay
Receiver Adapter Wireless Bluetooth 5.0 Adapter USB + 3.5mm Jack Stereo Audio For Car AUX Speaker
Aliexpress UK