1. 4 MIDI inputs and 4 MIDI outputs (64 MIDI channels) 2. Merge function 2 ins> 4 outs included 3. Perfect MIDI timing 4. High-speed connection to USB-equipped PC or Macintosh computers 5. USB-powered, required no external power supply 6. Compact size, light weight, easy to carry 7. Compatible with Windows XP, Vista, 7 and Mac OSX or better 8. Plug and play, do not need to install driver 9. 1 * USB 2.0 interface, 8 * MIDI interfaces 10.with a random bracelet from our picture for gift