Key Features: » detachable, fold-down face » variable button color » plays MP3 and WMA files » plays audio CDs, CD-Rs and CD-RWs » MaxTune SQ tuner » 12 FM/6 AM presets » Bass Engine Plus (bass center frequency, width, and level, plus treble center frequency and level adjustments, as well as 4-channel digital time alignment and a 3-position, 12dB/octave crossover, subwoofer level and phase control) » MediaXpander (restores clarity and detail to compressed or broadcast audio) » source tone memory » iPersonalize setup options » XM and SIRIUS Satellite Radio controls » CD changer controls for Alpine Ai-NET changers only » optional auxiliary input » 4-volt front, rear and subwoofer preamp outputs » MOSFET internal amp » clock » wireless remote » 18 watts RMS/50 peak x 4 channels (CEA-2006 Compliant) » CD frequency response 5-20,000 Hz » CD signal-to-noise ratio 105 dB » FM sensitivity 9.3 dBf » warranty: 1 year