The Numark STEREO|iO connection box converts analog audio into a digital signal. STEREO|iO has RCA plugs for use with virtually any audio equipment from DJ mixers to turntables, and the USB connector on the other end is for your Mac or PC. Use the STEREO|iO to connect any line or phono-level gear to your computer for recording, mixing, or processing. You can also use STEREO|iO as a line out from your computer to inputs on an analog mixer, enabling you to mix MP3s and other music from a computer in your standard DJ mixer. The Numark STEREO|iO interface is an invaluable low-cost, tool when DJs or musicians at a gig or in the studio need to make connections. The class-compliant USB device offers true plug-and-play, requiring no software-driver installation or external power for operation.