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 > 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: 146.5*83.5*40mm/5.77*3.29 * 1,57 inch Item Weight: 303 g / 10,69 oz Package Weight: 466 g / 16,44 oz List of packages: 1 * MIDI box 1 * Cable 1 * manual (English)