This is a simple foot switch that JHS Pedals produced to operate additional footswitching functions on certain of its own models.
Before buying on Musix, I wrote to JHS to ask if it would also function with the Boss-JHS JB-2 Angry Driver. The company wrote back promptly to report that it does, even though the JB-2 is not listed as a compatible device on their website.
And it does work. Better than the Boss FS on a pedalboard in my opinion as it is more compact and so takes up less space, and doesn't have the rubber backing that hook-and-loop doesn't stick to well. And it's fire engine red. What could be better? Good for switching between various Bluesdriver and Angry Charlie modes on the JB-2.
Many thanks for the quick response and help. Much appreciated!