Dual MXDM66 Marine Stereo 10 Character positive white/black dot matrix LCD display 3 Sets of 2V preamp outputs (front, rear and subwoofer) Front-panel auxiliary input: 3.5mm (headphone jack) allows connection to portable media devices such as MP3 players, etc. Front-panel USB port: High-speed USB input allows connection to portable media devices such as MP3 players, etc. Power Output: Peak: 50 watts x 4 channels / RMS: 17 watts x 4 channels