Need to connect MIDI from the mixing board to the stage in a concert hall? MIDIMizer-Long Range Duo is for you! MIDI lengths of greater than 1 kilometer! MIDIMizer-Long Range Duo allows you to send and receive two pairs of MIDI Out/In over a single CAT5 (or Cat5e, Cat6) cable with lengths of over 1 kilometer (0.62 miles). MIDIMizer-Long Range Duo is sold in pairs. You supply the CAT5 cable & standard micro-B USB power supplies, and youre ready to go!