BOSS offers two types of footswitches to choose from depending on your application. The FS-5U is a momentary-type footswitch and the FS-5L is a latch-type footswitch.
Boss DR Beat Metronome
Boss WL-20 Digital Wireless Guitar System with Cable Tone Simulation
RC-1 Boss Loop Station
Boss TU-01 Clip-on Chromatic Tuner