? 4-channel receiver;? 300W output;? Freq resp: 20Hz-20kHz;? Imp: 8ohm ;? Bluetooth(R) version 3.0;? AM/FM radio;? Digital LCD display;? USB, SD(TM) Card, aux, 2 x 1/4 microphone & 2 x RCA inputs;? 2 x RCA outputs;? Compatible with MP3, WMA & WAV file types;? 4 pairs of speaker terminal binding posts;? Compatible with external mobile devices;? Auto scan & tuning control;? 50 radio memory prests;? Built-in ventilation cooling fan;? Volume, bass, treble & echo controls;? Microphone volume, bass, treble & echo controls;? 110V-220V switchable power;? Dim: 4.7H x 12.2W x 16.9D;