The Rolls MA252 Compact Class D Stereo Amplifier features 20 watts per channel and a 4-channel integrated audio mixer. The MA252 is an ideal solution for mixing audio in halls, small presentations and other applications. The mixer features an XLR microphone input, two RCA line inputs, and a 1/8" (3.5mm) mini input for connecting portable audio devices such as MP3 players. Connect a pair of speakers right into the left / right speaker post outputs. Each channel features a level control dial on the front panel. The MA252 features a compact chassis and class D low heat emission, allowing it to be in tight spaces where proper ventilation would otherwise be an issue.