100V & 4-16Ω,rated power 250W 6 zones with 100V output and with individual volume control Built-in MP3 player by USB & SD and FM tuner. 4 microphone inputs, Mic 1 with priority and muting function, Mic2-4 with XLR input, Mic3- 4 with phantom power 3 aux line input & 1 aux line output and with chime output Each microphone and line input with individual volume control Bass and treble control Short circuit, overload and high temp protection