The input voltage: DC12-26 v (Recommend use 24v more than 3A Power supply)Output power:80W+80W+100WOutput resistance:4-8ohmChip:TDA3116D2Frequency response range:14-100KHZSwitching frequency:1.2MHZSignal to noise ratio:100dbSize:116*74*29mmThis 2018 Latest Version 2.1 Channel TPA3116 digital Power Amplifier Board,With TWO NE5532 OP AMP ,