CSR8645 APT-X HIFI Bluetooth 4.0 12V Receiver Board for Car Amplifier Speaker
1x CSR8645 Amplifier board. M + and M- is the positive and negative of the microphone. COM is the common side of the key,the other end of the key are then VOL+,VOL-, PREV,NEXT,PLY. Long press 1s "PLAY" + "VOL+" key: Turn on 1 drag 2.