With optical audio input Separate adjustable high and low tones Support 220V current input Use of multiple audio Low heat generation and long service life Car Bluetooth digital amplifier board with optical audio input Output power:220V Power supply voltage: DC12 24V Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. Colour:black Material:PCB Size:15.5 x 4.5 x 5cm Package Contents: 1 x amplifier version 1 cable 1 x remote control 1 x speaker cable 1 x DC cable 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.