The MIDI Match system consists of two identical bidirectional MIDI Match units, one for each line. MIDI signals are converted into a balanced signal that can be transmitted over long distances while remaining immune to noise and interference. Each unit contains separate receiver and transmitter, enabling the simultaneous reception and transmission of different MIDI data. Two LEDs on each unit monitor incoming MIDI data from the XLR or MIDI inputs, as well as indicating the 9V power supply.
Features:
Sends MIDI data over distances of up to 4,000 feet
Immune to noise/interference
Independent dual circuit

Applications:
Remote control of MIDI lighting equipment
Send MIDI through an audio snake
Use existing studio cabling for
Church and/or Concert MIDI transmission
This includes: 
The original box, 2 power supplies, 2 manual MIDI Match devices