16 MIDI input channels and 16 MIDI output channels LEDs indicate power in, MIDI in the signal and MIDI signal out USB bus; Does not require external power Supports Windows XP, Windows 7 Cable length: 2.0 m (6 ft) How to use: Connect the "up" to the MIDI "OUT" jack of a MIDI keyboard Cable (or MIDI device). Connect the "OUT" to the MIDI "IN" socket of a MIDI keyboard Cable (Of MIDI device). Plug the USB cable into a free USB port on the computer, The red LED is lit to show the power supply. Open up your music software program, such as Cubase, Sonar, MIDI connections, ect Set the music to MIDI in And MIDI-out devices "USB Audio Device" Your USB MIDI interface is now ready for use. Material: plastic Colour:as shows Included: 1 x USB electronic organ music line Note: Light shooting 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.