The flykantech.com UMB06 is a 3-in-1 5-pin MIDI Interface Device. It supports three functions: 4-In/4-Out USB-MIDI Mode, 2-In/4-Out MIDI Merge, and 4-In/4-Out MIDI Thru. Switching between functions is done easily with the Mode Switch Button. The device is Bus-powered, requiring no additional power supply. The UMB06 features an aluminum housing, 8 port Status LEDs, and 1 x Mode Switch Button, and it supports the Simultaneous use of multiple UMB06 units to expand the number of MIDI ports.