Compact Control Unit – Stereo Headphone Output Level Adjustment – Independent Channel Rotary Volume Controls – (4) 1/4” Stereo Headphone TRS Output Connector Jacks – 1/4” TRS Source Input Connector Jack – Power On LED Indicator – Power Supply Included, DC 12V/150mA – Dimensions (W x D x H): 4.07” x 1.18” x 2.24”