Features: brand new and high quality Bluetooth-compatible5.0, support serial port to change the name, support one-key TWS pairing, support AUX to insert TWS to the box continuous line, support calls, power on, the default volume is maximum TX-, RX, GND: TTL- serial port configuration 9600, 8, 1 At 16V 4A-, the maximum output power is 30W; At 12V 4A-, the maximum output power is 20W DC8-22V power supply, with reverse connection for protections, support notebook power adapter power supply Connect the positive and negative of the microphone Binaural Amplifier Board only,other accessories demo in the picture is not included Specifications: Material: Plastic Amplifier Board Size: approx 7.1x4.3cm/2.80x1.69in Fixed Hole Distance: 6.6x3.8cm/2.60x1.50in Color: As the pictures shown Quantity: 1Pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Binaural Amplifier Board