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.8-22V power supply, with reverse connection protection, support notebook power adapter power supply.Boards and devices are -crafted, with sufficient materials and quality.Mand and M- are the positive and negative of the microphone.TX, , GND: TTL serial port configuration 9600, N, 8, 1Power amplifier board size: 7.1x4.3CMFixing hole distance: 6.6x3.8CMType: B: not supports calls.type: Amplifier Boardcolor:BlackMaterial:PCBandelectronic 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.