The MC4-D is a mic/line audio mixer with a digital Toslink input designed to integrate with video displays that only provide a digital output. Fits into a two gang electrical box with RJ45 connection that provides power audio, balanced/mixed signal through a CAT5 cable. Includes a 15VDC, UL listed, efficiency level V (Energy Star) power supply. ideal for classrooms, digital signage and hospitality applications.