In commemoration of M-Audio's 20th anniversary, the Midiman MIDISPORT 4x4 Anniversary Edition gives the popular multi-port USB MIDI interface an updated new look. MIDISPORT 4x4 Anniversary Edition addresses a total of 64 x 64 discrete channels of MIDI I/O via USB, allowing you to simultaneously connect a variety of MIDI devices. Bus-powered architecture provides the option of totally mobile operation. FEATURES: · 4-in/4-out MIDI interface > 64 discrete MIDI input channels, 64 discrete MIDI output channels · USB bus power > requires no external power supply · Class-compliant operation with Windows XP, Vista and Mac OS X > true plug-and-play functionality · Compact and lightweight > mobile or desktop use