20W+20W+40W 2.1 -channel output delivers outstanding sound performance to drive most home, car, marine and outdoor passive speakers and subwoofers. Bass volume control allows separate adjustment of high and low frequency, with heavy bass enhancement, low distortion, and acoustically accurate reproduction of music. RCA/AUX Inputs, compatible with various devices, such as mobile phone, MP3, MP4, CD player, TV, computer, etc. Subwoofer/Bass/Treble Control by knobs for fine adjustment. DC 12V 2A power adapter, easy to install and operate, suitable for car, boat, RV, golf cart or at home