BOSS offers two types of footswitches to choose from depending on your application. The FS-5U is a momentary (NON-LATCHING)type footswitch
MOMENTARY "UNLATCH" FOOTSWITCH
Roland/BOSS offers two types of sturdy metal footswitches for different applications. The FS-5U (silver) is a momentary "unlatch"-type footswitch, and the FS-5L (black) is a latch-type footswitch with an LED to indicate status. Both footswitches can be connected using ordinary guitar cables. Please consult your owner's manual for compatibility.