4 MIDI inputs and 4 MIDI outputs (64 MIDI channels). Perfect MIDI timing. High-speed connection to USB-equipped PC or computers. USB-powered, requires no external power supply. Mini compact portable size. Can switch between USB mode and 4 Through modes. Compatible with Windows XP, Vista, 7, and OSX or later. True plug-and-play; no driver installation required for Windows XP, Vista, 7, and OSX. Color: Black Material: Iron Package Contents: 1 x MIDI Box 1 x Cable 1 x English instruction manual Only the above package content is included; other products are not included. Note: Light reflection and different display settings may cause slight color variations between the item in the picture and the actual product. Measurement error allowance is +/- 1-3 cm.