16 MIDI input channels and 16 MIDI output channels 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: 1. Connect the "up" to the MIDI "OUT" jack of a MIDI keyboard Cable (or MIDI device). 2. Connect the "OUT" to the MIDI "IN" socket of a MIDI keyboard Cable (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 , Sonar, MIDI connections, 5. Set the music to MIDI in And MIDI-out devices "USB Audio Device" 6.Your USB MIDI interface is now ready for use. Material: plastic Color: as shown Included: 1 x USB electronic organ music line Use 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 drive Only the above package content, other are not included. Note: Light reflection 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.