The Hughes and Kettner FS-1 is a one channel single footswitch.
Footswitch with LED, phantom powered for Tube 20, Studio 54, Attax 80, Basskick 515, Basskick 707, BassForce XL, BassForce XXL, Edition Silver, Metroverb.
Well built footswitch, no problems connecting it. However, on the H&K Tubemeister 18 the switch leaves the Lead Boost on at all times, it cannot be turned off. Given the similar price, the FS 2 would be a better option.