AK-170 HiFi Stereo Audio Power Amplifier 200W+200W Dual Channel Power Amp with RCA Input. High-fidelity mini audio power amplifier with low distortion for clearer sound. Made of aluminum alloy with a big knob designed with blue LED lights. Specifications include input voltage of 12V DC, effective power of 20W+20W, maximum power of 200W+200W, and signal to noise ratio of over 70 decibels.