This pedal is one of many basic controllers for analogue guitar amps. I bought it for a H&K edition silver combo a few years ago. It has a mono jack and one switch which means that you can use it with any two-channel amp. Have a look at the specs of your amp before ordering the pedal!
It has a very stable metal casing and the switch itself has a good quality as well. However, the weak spot is the wiring. The cable goes into the box at the back of the pedal where it is fixed with a small rubber-like thingy which is supposed to keep the cable in place. But apparently it doesn't do its job that well. At least the joints that connect the cable with the switch inside the box broke after like two years of occasional at-home-use.
I bought this some time ago for use with my H&K Studio 84, to switch between the clean and overdrive channels in both live and practice situations. It works fine, maybe a bit pricey for a simple switch in a metal case, but it is sturdy and has never let me down.
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