The CAJ MIDI pro Station features five switches. It allows MIDI connections and supports DC 9V power input. - Model Name: CAJ MIDI prg Station - Connectors: MIDI Out, Link, Input - Number of Switches: 5 switches - Power Input: DC 9V - PS4, PS5: Pedal switch connection Thank you for viewing. I was using this as a footswitch for my Kemper. It shows signs of use. Cleaning and operational check have been performed.