Item Type: MIDI Adapter Board_x000D_ Size: Approx. 57.4 x 53.1mm / 2.3 x 2.1in_x000D_ Compatible: 100% fit for arduino_x000D_ PCB Board Color: green1With the MIDI Adapter Board, for Arduino board or other microcontroller can access powerful MIDI communication protocols. 2The MIDI protocol and the asynchronous serial interface have many similarities, so the user can send MIDI event information using the microcontroller UART pin. 3The MIDI riser board provides MIDI-IN and MIDI-OUT connections as well as MIDI THRU ports. 4MIDI - port is light IN isolation to prevent ground loops. 5The MIDI adapter board can be mounted directly like the shield on the top for Arduino board: connect MIDI-IN / THRU for Arduino hardware RX pin and MIDI-OUT to the TX. 6Its for Arduino data and analog pins, power bus and bus can be turned out. 7The RUN/PGM switch can let users for Arduino board serial port programming, without having to remove the board.The three hole MIDI connector no welding on the MIDI adapter plate, but these connectors included in this product.1 xMIDI Adapter Board