16 MIDI input channels and 16 MIDI output channelsLEDs indicate power in, MIDI in the signal and MIDI signal outUSB bus; Does not require external powerSupports Windows XP, Windows 7Cable length: 2.0 m (6 ft)How to use:1. Connect the "up" to the MIDI "OUT" of a MIDI keyboardCable (or MIDI device).2. Connect the "OUT" to the MIDI "IN" socket of a MIDI keyboardCable (Of MIDI device).3. Plug the USB cable into a free USB port on the computer,The red LED is lit to show the power supply.4. Open up your music software , such as ,Sonar, MIDI connections, 5. Set the music to MIDI inAnd MIDI-out devices "USB Audio Device"6.Your USB MIDI interface is now for use.Material:plasticColor: as shownIncluded: 1 x USB electronic music Use the registration matters: USB has not been successfully , you need to change the interface to drive or download the driver to drive the computer's USB driveNote: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.