The FS-5U Footswitch from BOSS is a momentary unlatching footswitch/pedal that works with either electronic keyboards as a sustain pedal, or for quickly engaging and disengaging effects processors. The sturdy metal footswitch pedal is only active for the duration of time that it is depressed, and an example of it's creative application would be the emphatic punctuation of specific musical phrases, during an instrumental solo, with a dramatic delay or reverb effect setting. FS-5U is a passive pedal, requiring no power input, and sports a universal 1/4" jack.