3 Channel, 40W at 70V/ 100V, 1 balanced mic, line or Tel input with Phantom power, 2 unbalanced summing line level inputs, variable VOX mute Sensitivity for input 1, contact closure mute terminals, 50 Hz to 20 kHz, global power supply (100vac-240vac, 50/ 60 Hz), Phoenix and RCA connectors, compact 1RU 1/2 rack, 8.5"W x 1.75"H x 7.9"D.