They must be adjustable for sensitivity.
Our neighbor has one that operates a very bright light.
Unfortunately, if it is adjustable, they have never figured out how.
Passing cars set it off, let alone people just walking by, on the sidewalk.
Very glad it's not connected to a siren.
Or a paintball gun.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”