Make sure this it what you need
This is a good basic AB switch. It uses the tongue and groove design that allows it to be firmly mated with Boss' trigger switches. It terms of function and solid construction it is a great footswitch.
Be aware that it requires internal battery power, using a pair of AA batteries and it takes a screwdriver to change them. The unit switches on when you connect the cable, which means it can't be left connected on a pedal board. For a minimal expense and a bit of effort you can wire in a jack for 9v power using hacks available online. Note that this has a plastic bottom with ridges and the material does not work the adhesive on the back of velcro – it simply does not stick, so you have to attach it to a pedalboard using zip ties or another system.