Assembled Kit 1W Mini Stereo Amplifier TDA2822M 3-12VDC supply [FA673] &lt;==Beware to Add To Cart !!! Only sold by Thaikits for product warrantee and free technical support. Require power supply 9-12vdc / Current consume 500mA max at 9VDC 8Ohm speaker at 1W Adjust sound level by 2xtrim POT on board for each channel / Output power 1W Stereo ( 1W for LEFT and 1W for Right ) Input Sensitivity 1kHz/500mW : 120mV / S/N = 70dB PCB size : 2.16