Bluetooth Audio Receiver Board - RCA(Apt-X) TSA7804B The LED will fast blink

The LED will fast blink if the battery voltage less than DC22V

two buttons on the module can be configured to have different functions as you need

In TWS mode

it works the same as the S1 button on the module

SPDIF audio signal has higher priority

Bluetooth Audio Receiver Board - RCA(Apt-X) TSA7804B The LED will fast blinkThis Bluetooth Music Receiver connects to the RCA input on your home audio system. You can then stream audio from your Bluetooth enabled cell phone or mp3 player to your home audio system. Enjoy the convenience of having your music source in the palm of your hand and listening to it through your home stereo. it comes with a new AudioB plus Bluetooth module that supports Apt X. Features: Size: 56*33*15mm Bluetooth 5. 0 19mA@5V Apt X supported Stereo