Microphone Input - 3-level Mic input with mixer function Amplify Your Sound - Outputs Stereo 20Watt@4 Ohms or bridged mono 40Watt@8 Ohms Compact - Small form factor ideal where full-sized amplifiers will not fit Multiple Control Options - Take control using RS232, IR, or push buttons Durable - Metal enclosure designed to last for years Bass, Treble, & Volume - Control bass, treble and volume levels conveniently using integrated push buttons