I've got no experience with the original "The Clapper", but I had a DIY solder kit for a clap-switch. From what I could figure out that thing would look for two transients with a fairly specific amount of non-transient in between. So clap-clap would trigger it, but not clap...clap or clapclap or clapclapclap. Applause would not trigger that thing. But to be fair neither would trying to activate it without some practice first.

So that is what the thing is called, I use these when climbing trees and working on high buildings on the farm. I made a longbow with a strong enough pull to shoot a heavy arrow (a piece of an old broom handle with PET-bottle wings on the back) attached to a nylon line used to pull the safety line over/through whatever I happen to need to fix. Thus far I have not had the misfortune to test the efficacy of the 'screamer' but I'll be sure to scream if I ever have to.

Lol, don't tell people how to take their drugs. There are interesting things to be found at the edge.

I would have thought a screamer is a climber on the fastest possible descent.