The USB Mix 3-Channel Mixer and Computer Audio Interface from ART is a compact and versatile mini mixer, ideal for home or mobile studios. It is also a computer interface that will convert analog input signals into digital USB signals that can be sent to your computer. The mixer has an XLR TRS combo input that can be switched for mic or line use. It will even supply +48V phantom power to support condenser microphones. There are balanced 1 4 line inputs that accept stereo or mono sources. There are also 1 4 main outputs and a 1 4 headphone jack for convenient monitoring. Independent gain and level controls are provided for each input, the main output, and the headphone output. The mixer has a USB 2.0 output that will send your audio to your computer for recording and editing. You can even switch USB playback to channels 2 and 3 for additional versatility. Audacity recording software is included so you can get started right away. When used with a computer, the mixer operates via USB bus power. When used without a computer, it is powered with the included AC adapter. A green red LED shows signal and clip status.