Edifier USA C2XD Optical 2.1 Multimedia Audio System 3.5mm, Optical and RCA input options for connectivity to consoles and media centers and additional 3.5mm input and Headphone output conveniently on side of the amplifier full-range driver in each satellite External amplifier with LED digital display Infrared remote control for volume, bass and treble adjustments, input selection, mute and standby and Volume dial, input selection, bass and treble adjustment located on the amplifier Edifier Intelligent Distortion Control (EIDC) technology effectively reduces distortion; maintaining great audio at the loudest volumes.