This MIDI conversion device is the ultimate companion for music editors that can connect multiple MIDI devices to create music. Characteristics: 4 MIDI inputs and 4 MIDI outputs (64 MIDI channels). Function andgt 4 outputs included. Perfect MIDI timing. Fast connection to a PC or computers equipped with a USB connector. Powered by USB, no external power source required. Mini compact portable size. It can switch between USB mode and 4 pass-through modes. Compatible with Wins XP, Vista, 7 and Mac OSX or better. True plug-n-play, no need to install driver for Wins XP, Vista, 7 and Mac OSX. Technical data: Material: metal Product Size: 146.5x83.5x40mm or 5.77x3.29 x 1,57 inch Item Weight: 303 g or 10,69 oz Package Weight: 466 g or 16,44 oz List of packages: 1 x MIDI box 1 x Cable 1 x manual (English)