For those electronic keyboards with an input jack labeled "SUSTAIN," the FC4 is used in the same manner the sustain pedal on an acoustic piano is used. A specially designed rubber bottom grips the floor and stays put while you play. The FC4 can also be utilized as an FS controller for synthesizers, tone modules and drum machines. Works with any keyboard utilizing a sustain pedal with a 1/4" connector. Included 6-foot cable 1/4" phone plug