Product information: Bluetooth 5.0, supports serial port renaming, supports one-key TWS pairing, supports AUX insertion into TWS pair box, power on and up, the default volume is the highest.When 16V4A, the maximum output power is 30W; When 12V4A, the maximum output power is 20W.8-22Vpower supply, with reverse connection protection, support notebook power adapter power supply.Boards and devices are -crafted, with sufficient materials and quality.M+ and M- are the positive and negative of the microphone.TX, , GND: TTL serial port configuration 9600, N, 8, 1Power amplifier board size: 7.1x4.3CMFixinghole distance: 6.6x3.8CMType:B: not supports calls.type:Amplifier Boardcolor:BlackMaterial:PCB+electronic componentsPackage Contents:1 x TWS AmplifierOnly the above package content, other products are not included.Note:Light reflection and different displays may cause the color of the item in the a little different from the real thing.The measurement allowed error is +/- 1-3cm.