It might be worth knowing what kind of garage door opener you have anyway. I have never had an external impulse button and therefore don’t understand the “clamps” comment. I have only ever used RF Remotes, but the door opener does have connections at the back of it that an impulse switch I.e. an SI, can be connected to. Often you can also get you power from the door opener.
Totally agree with Fantross re the advantage of the SI. I connect a simple magnetic reed relay switch to my SI inputs and it can tell me if the garage door is open or closed. As there are 2 inputs I also use a reed switch on the side door of my garage to alarm that door as well, even though I only use 1 output. There is even a way to have the state inputs to be monitored by the Surveillance App which is very handy.
The SI is a great solution, it took me ages to finally work out how to get it working with help from @DirkG and others, but now that it is working it has been 100% reliable.
