Two way RS-232 serial connection Four line-level audio and four composite video inputs Input 1 auto select priority function, defeatable External IR repeater Input jack Remote control includes discrete codes for Off and On Switchable auto or manual turn on/off 12 V trigger automatic turn/off, defeats Power button 12V output to trigger other components Record outputs for video and fixed level audio eadphone jack, automatically mutes line out Gold-plated RCA jacks Analog motor-driven volume control Outstanding design, parts quality and specs Voltage switchable between 115v and 230v Unique half-rack width chassis; 1 rack space high Fastening hardware available for rack mounting