6 inputs (each with a volume control), 200W into 25V/70.7V and 4 ohm loads, Ideal for background music, paging and MOH, includes push here diagnostic (phd) button, Master level control, preamp in for external processors, 4 balanced mic/ line/ Tel inputs with Phantom power, 3 unbalanced summing line level inputs, variable mute Sensitivity control for input 1, contact closure mute terminals, rear mounted dip switch allows for Mute receive for inputs 1 through 6, rack mount sold separately (Aarmk20), 16.6"W x 3.7"H x 14.6"D.