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 , 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 products 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.