1. Lastest version with a built-in driver * 2. USB Powered and Class Compliant for true plug & play.Just connect to a computer USB socket for automatic installation of the driver. * 3. 1 in and 1 out MIDI interface; 16 MIDI input channels & 16 MIDI output channels * 4. LED"s indicate power on, MIDI in signal and MIDI out signal * 5. Supports Windows XP, Vista and Mac OS X operating systems 6. Length: approx 2 M