Class D Mini 2 Channel Power Amplifier (20 watts by 2 channels) Model: T-220APFeatures Class D high efficiency amplifierStereo output 20 watts by two channels and bridge output 40 watts by one channel2 Mic/line switchable inputs: 2 unbalanced dual RCA auxiliary inputs and 2 balanced mic/line switchable inputs by phoenix connectorsDual left and right channel volume controls2 channel outputs by phoenix connector, bridge or stereo output two options, with bridge/stereo switchSpeaker stereo outputs at 4 ohms and speaker bridge output at 8ohmsBuilt-in limiter for low noise and efficient operation, with limiter on/off switchDC 24V power supplied by power adapter accommodate of AC120V or 230V inputSmart compact size for tabletop or wall mount design