DROK TDA7297 15W+15W Audio Power Amplifier Module AC/DC 9-18V 2.0 Dual Channel Stereo Amp Board, DIY Sound System Component DROK 2.0 dual outtput channel amplifier input voltage range is AC/DC 9-18V, recommend 12V, 2A; output power is 15W+15W; can be connected to 4 to 8 ohms/ 10 to 50W speakers. The audio amplifier is suitable for AC and DC circuit usage; with CBB capacitance of 2200UF/25V. Tiny appearance but with high volume; it has knob for you to screw the potentiometer. It has the fan for cooling and is soldered already so that you can use it directly. The Blue LED indicator light will be on when amplifier power on.