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" jack 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 program, such as Cubase,Sonar, MIDI connections, 5. Set the music to MIDI inAnd MIDI-out devices "USB Audio Device"6.Your USB MIDI interface is now ready for use.Material:plasticColor: as shownIncluded: 1 x USB electronic organ music lineUse the registration matters: USB has not been successfully driven, you need to change the interface to drive or download the driver to drive the computer's USB driveNote: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.