Bluetooth transmitter receiver + transmitter B9

Here is a simplified version of the product description:

This is a 2-in-1 universal Bluetooth transmitter that can both send and receive
Bluetooth signals. It’s a handy device that can upgrade any of your gear to have
Bluetooth capabilities. It uses the latest Bluetooth 5.0, which provides fast
data transfer, consumes less power and provides a strong, steady signal.

Connecting and controlling things with the transmitter is pretty easy. You can
play music from your phone or other device to something else that uses the
AUX/RCA input. This means things like your old HiFi system, wired headphones or
TV can now send and receive data wirelessly. The unit has a TX-RX switch so you
can switch between transmit (TX) and receive (RX) modes, and an ON/OFF button to
turn the transmitter on and off. Includes Bluetooth adapter, 3.5mm AUX audio
cable, RCA cable and USB cable.

Here are the main features of the product:

* Bluetooth version: 5.0/4.2
* Bluetooth profile: A2DP, AVRCP, HFP, SPP
* Range: up to 10 meters
* Compatible with: Android, iOS
* Operating temperature: up to 60 degrees Celsius
* Battery life: up to 6 hours
* Features: Fast charging, can be charged while working
* Control: LED indicator, TX-RX switch and ON/OFF button, easy pairing
* Features: Sound reduction, Safe Chip, stereo sound support
* Included accessories: Bluetooth adapter, 3.5mm AUX audio cable, RCA cable,
USB cable