4 MIDI inputs and 4 MIDI outputs (64 MIDI channels).Perfect MIDI timing.<br> High-speed connection to USB-equipped PC or computers.<br> USB-powered, required no external power supply.Mini compact portable size.<br> Can switch among USB mode and 4 Through modes.Compatible with XP, Vista, 7 and OSX or better.<br> True plug-n-play, you do not need to install driver for XP, Vista, 7 and OSX.<br> Colour:Black<br> Material:Iron<br> Package Contents:<br> 1 x MIDI Box<br> 1 x Cable<br> 1 x English instruction manual<br> Only the above package content, other products are not included.<br> 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.