3 in 1 Function, combined with USB MIDI, and thru functions. 4 Inputs, 4 Outputs MIDI interface (64 MIDI Channels). MIDI Function for mixing data of the inputs1 and 2, 4 output. Perfect MIDI timing, USB powered (no external power supply requires). High-speed connection to USB equipped PC or computers. True Plug and Play & Wide compatible, users do not need to install drivers. Mode SW: USB and MIDI THRU mode switch button. This button lets you one of the 5 operating modes of the interface ( One USB mode and 4 MIDI Thru modes) With this MIDI Box, you can obtain perfect midi timing and performance at an extremely affordable . Compatible with Windows XP, Vista and OSX or better MIDI in and MIDI out activity indicators for each port USB powered (no external power supply requires) Material:metal colour:black Package Contents: 1 x MIDI box 1 x cable 1 x English manual Only the above package content, other products are not included. Note: Light 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.