From the manufacturer:

The DigiTech FS3X is a welcomed addition to several DigiTech products; The Jimi Hendrix Experience™, The JamMan® and Expression Factory™ to name a few. The FS3X provides increased functionality and convenient Hands-free™ control over UP/DOWN selection of Models, Mode changes, Loop selection, auto START/STOPS and arms auto record where applicable. Compact and portable its small foot-print takes very little space on stage or in your gig bag. Durable 3 button metal chassis construction. A 10' stereo TRS cable is included with each unit. GET THE MOST OUT OF YOUR DIGITECH PRODUCTS WHILE PERFORMING OR PRACTICING