Over-temperature and short-circuit protection against static electricity adjustment of treble and bass Supports Bluetooth 5.0 connectivity With heat sink Support external antenna Bluetooth version:5.0 Input mode:AUX + Bluetooth Adaptable power supply:DC12 - 24V Output power:left and right channel less than equal 100W Protection mechanism:undervoltage, overheating, overcurrent, short-circuit protection Batch differences may lead to product appearance, text, color will be different, does not affect the use of Colour:Black Material:PCB+Metal Size:9.9x6x2.1cm Package Contents: 1 * amplifier board (need to install themselves) 1 * screwdriver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.