I think what I am unclear about is how the crook gets the signal. Is it as simple as recording it once and using it again later? Does they key change between u

I think what I am unclear about is how the crook gets the signal. Is it as simple as recording it once and using it again later? Does they key change between uses? Otherwise the attack seems arbitrary. If my key keeping bowl at home physical security is compromised I have someone in my house. I generally dont leave my keys out anyway, but a nefarious plumber/home contractor could potentially gain access.