Two group microphone inputs, two group line inputs, a group microphone has the first function 1, Specified output:100W 2, Output form: (one) decides the anti- 4-16 ohms (two) constant pressure 70V/110V(120V) 3, Frequency response: 40HZ±18HZ±0.5Db 4, Volume: 432X327X88mm (cube).