The FS-5L (black) is a latch-type footswitch with an LED to indicate status.
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.