The foot pedal is an extension wire with a foot switch on the end. This pedal pulses the high frequency coil for  the duration of the time the pedal is depressed. This pedal should only be pushed when there is a plate or electrode connected to the output of the unit.

 Plug foot switch into jack marked "Foot Pedal." The pulse button will still be active when foot pedal is plugged in.
 

The foot pedal should be located in such a position that it cannot accidentally
be stepped on, causing an unexpected discharge.