Supports Bluetooth 5.1 connectivityOver-temperature and short-circuit protection against static electricitySupport Bluetooth,AUX,U disk,USB,sound card inputWith heat sinkVolume can be adjusted independentlyNote:It needs to be assembled by yourself, and the material package is given a screwdriver.The suitable power supply of the product is DC power supply, not AC power supply.Batch differences may lead to product appearance, printed text, color will be different, does not affect the use ofColour:BlackMaterial:PCB+MetalSize:6x6x3.2cmPackage Contents:1 * amplifier board (need to install themselves)1 * screwdriverOnly 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.