Features: New generic Midi Box 4x4 USB Midi Interface 100% brand new and high quality Plug and play Perfect MIDI timing 100% brand new and high quality Merge function 2 ins to 4 outs included USB powered, no external power supply required 4 MIDI inputs and 4 MIDI outputs (64 MIDI channels) MidiBox 4-in/4-out USB 64-MIDI interface thru/merge box Compatible with: Windows XP,Vista,Win7,Mac OSX or better High speed connection to USB equipped PC or Macintosh computers Specification Material:Plastic & Metal Dimensions: 20X16.5X6.5cm Weight: 18.65 ouncePackage contents: 1 X Midi Box 4x4 USB Midi Interface 1 X USB Cable