What sold me on this mixer was the USB output built right into the mixer. No more plugging into the headphone jack on your laptop, or using 3rd party USB sound cards. With 2 USB hookups you can have one for your output so whatever your playing is going out to your speakers. Set the other USB up for input with the flip of switch and you can record your mixes, all through the mixer. No software drivers needed for use with Windows XP/Vista/7 or Mac OS X just plug and play! It also includes, five-channels, inputs: three phono (RCA), eight line (RCA), three mic (1/4″), outputs: Balanced (XLR), Master (RCA), Record (RCA), Zone (RCA), Headphone (1/4″ stereo).