This Wah Is a Dunlop Crybaby that  is modified so you dont' have to stomp down to activate it. Simply put your foot down own the pedal and the small monetary switch activates the circuit . No stepping down first to push the on / off switch.  Simply put your foot on the treadle(pedal) and crank out a quick wah laced riff or lick and as soon as you lift your foot it goes back regular mode. It is TRUE BY PASS . Also this pedal can be used in  regular mode so it can be used as a EQ filter as some players do or just used like you would normally,by stepping down and manually activating it.