Feature:1. 4 MIDI inputs and 4 MIDI outputs (64 MIDI channels).2. Merge function 2 ins-\u003e 4 outs included.3. Perfect MIDI timing.4. High-speed connection to USB-equipped PC or computers.5. USB-powered, required no external power supply.Specification:This MIDI conversion device is the best companion for music editors to connect multiple MIDI devices for music creation.Features:4 MIDI inputs and 4 MIDI outputs (64 MIDI channels).Merge function 2 ins-> 4 outs included.Perfect MIDI timing.High-speed connection to USB-equipped PC or computers.USB-powered, required no external power supply.Mini compact portable size.Can switch among USB mode and 4 Through modes.Compatible with Wins XP, Vista, 7 and Mac OSX or better.True plug-n-play, you do not need to install driver for Wins XP, Vista, 7 and Mac OSX.Specifications:Material: MetalItem Size: 146.5 * 83.5 * 40mm / 5.77 * 3.29 * 1.57inItem Weight: 303g / 10.69ozPackage Weight: 466g / 16.44ozPackage Size: 20.5 * 17.5 * 6.5cm / 8.07 * 6.89 * 2.56inPackage List:1 * MIDI Box1 * Cable1 * Manual (English)Package List:1 * MIDI Box1 * Cable1 * Manual (English)