SainSonic AB-01 Mini Digital Amplifier Stereo Audio 12V Amp Board Amplify Module 15W+15W Dual Channel Power for Car Vehicle Auto Computer DIY Speaker Dual Channel Amplifier Board - Output power can up to 15W+15W (30W+30W-peak), it can be connected to 4 to 8 ohms 10-50W speakers. Power supply by direct current or be charged by 12V storage battery With high working efficiency and up to 90%, power saving, can work for more than 5 hours continuously after charging by 12V motocycle battery. Blue LED Indicator Lights - When amplifier power with CBB capacitance of 2200UF/25V. Built-in Potentiometer Knob - It can power by DC and AC power supply & Great application for car vehicle auto & DIY computer speaker, high quality sound. With heat sink and potentiometer, can be used immediately after wiring. The amplifier board has potentiometer knob and the heat sink,connect wire to use directly. Compat Design & Portable - It can be accessed by a large volume of small stature, a wide range of applications. No noise of the current when power on the device.