The Mini Round 3-Pin SPDT ON-OFF Rocker Switch is designed as a Single Pole Double Throw . This means it has one input (the switch itself) and two outputs. This is commonly used as an "on/off" function.
Tournament Lockout Function
Tournament lockout is an essential function when playing in a competitive setting. In tournaments, an accidental press of the start button or other option is grounds for disqualification.
The Tournament Lockout Harness will complete the ground from a Brook input control device, and the SPDT switch either connects or disconnects the ground. When disconnected, the option button input signal cannot complete, and therefore does not register as an input on the Brook device. This prevents an accidental press of an option button.