Alpine CDE-151 CD/MP3/WMA Single DIN Car CD Receiver with Bass Engine SQ, Red Features: CD receiver with AM/FM tuner, Built-in MOSFET amplifier (18 watts RMS CEA-2006/50 peak x 4 channels), Plays CDs, including discs loaded with MP3 and WMA files, and Remote control ready. Audio features: 3-band equalizer with ten presets, and Bass Engine SQ button with 5 presets Expandability: Inputs: front USB and auxiliary inputs, Outputs: 4-channel preamp outputs (2-volt front, rear/subwoofer).