TX mode will automatically search for other Bluetooth receiving devices (such as Bluetooth speaker, Bluetooth receiver, etc.). During pairing, the red light flashes twice a second. After pairing, the red light flashes once every three seconds, which is very successful.
eBay
Tebe Bluetooth 5.4 Audio Receiver aptX LC3 LE Audio Adapter 2 IN 1 Broadcast Receiver Transmitter with Mic for Auracast Headset
Aliexpress UK
3 Directly connects to a 30-pin dock for iPad, iPod, iPod Touch and iPhone, turning the speaker into a stylish wireless Bluetooth-compatible speaker that's easy to use. 1 Compatible with all Bluetooth compatible devices that support wireless music transfer (A2DP).
eBay
Bluetooth 5.4 Audio Receiver ENC Wireless Broadcast Adapter One with Multiple Audio System Clip-on Design AAC/aptX-AD/LC3 USB
Aliexpress UK
Bluetooth V5.0 technology. It is Not compatible with for iPod nano 6, iPod Mini 4GB Model M9804X (Version 1.4.1), iPod Touch 2nd, iPod Touch 1st, ipod classic 30GB. And aslo it don't support the Ipod ex factory date before 2007.
eBay
QCC3040 Bluetooth 5.3 Audio Receiver Transmitter One to Two Supports APTX 2-in-1 Receiver Transmitter 3.5mm Aux Audio Adapter
Aliexpress UK
Plug-and-Play Design – Easy to use via USB power and 3.5mm AUX connection. 1x AUX Cable (if included by the manufacturer). Bluetooth 5.0 Technology – Ensures stable and fast wireless audio transmission.
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Bluetooth 5.3 Audio Receiver AUX 3.5mm Jack Stereo Wireless Audio Adapter with Microphone for Car Earphones TV Speakers
Aliexpress UK
AUX interface connection, audio input and output. Connection mode: AUX connection input, output. Enhance the function of Bluetooth connection for all kinds of cars, stereos, TVs, tablets, desktop computers and so on.
eBay
Car Wireless Bluetooth Cable Adapter Receiver AUX HIFI Sound Quality Music Audio Stereo Receiver For 2RCA Interface Audio Line
Aliexpress UK
Bluetooth receiver (RX), Bluetooth transmitter (TX) two-in-one design. -Built-in digital signal to analogue chip, support digital optical, coaxial, AUX, RCA interface. Interface type: Input: 3.5mm AUX + RCA + optical + coaxial + USB.
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Digital To Analog Audio Converter With Bluetooth 5.1 Receiver Digital Optical AUX Coaxial Toslink To L/R AUX 3.5mm Audio Adapter
Aliexpress UK
√NEW IMPROVED BluTape: - 2nd generation to smooth any bugs out from the first generation and more features added. Transform your cassette player into a Bluetooth wireless cassette player. Stream music from any bluetooth enabled device such as your iphone, Samsung, Nokia, HTC Tablet Etc.
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Bluetooth-Compatible 5.0 Transmitter Receiver 2 in 1 Audio Aux Adapter Wireless Receiver for Handsfree Call for Car Audio Music
Aliexpress UK
The UGREEN Bluetooth Audio Adapter is a compact and versatile device that allows you to easily connect your audio receivers to Bluetooth-enabled devices, such as smartphones, laptops, or speakers. With Bluetooth v5.0 standard, this adapter ensures a reliable and fast connection for seamless audio streaming. Its sleek black design and 3.5mm jack port make it perfect for on-the-go use, providing you with a convenient solution for enhancing your audio experience. Made in China by Ugreen, this unit quantity of 3 adapters is a great addition to your home networking and connectivity setup.
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Bluetooth 5.3 Audio Receiver Wireless Audio Adapter With AUX 3.5mm RCA Optical Jack Support U-disk for TV PC Speakers Car
Aliexpress UK