detachable, fold-down face MaxTune SQ tuner 12 FM6 AM presets plays MP3 and WMA files displays MP3 text (ID-3 tags) V-Drive hybrid MOSFET60 internal amp - high-current draw requires direct fused connection to your battery Bass Engine Pro Media XpanderT 5-band parametric EQ XM Satellite Radio controls (XM Radio subscription, tuner, antenna required to receive the satellite radio signal.) - service not available in Alaska or Hawaii CD changer controls for Alpine Ai-NET changers only optional auxiliary input 4-volt front, rear, and subwoofer preamp outputs wireless remote clock 27 watts RMS60 peak x 4 channels CD frequency response 5-20. 000 Hz CD signal-to-noise ratio 105 dB FM sensitivity 9.