HiLetgo YDA138 220W Dual Channel Digital Amplifier Board Power AMP Module DC9-14V Wide voltage range: 9 to 14 VDC operable. The chip contains the amplifier function. High power. It can output 20 W 4. High-speed placement machine, more than 200 degrees return, stable performance. The gain mode settings have 4 groups, can adapt to different audio sources.