
This is a sub-sonic impact SENSOR.
The Big Bang Theory Season 1, Episode 11

All right, you're close enough
to Sheldon's room. Deploy the SENSOR.
The Big Bang Theory Season 1, Episode 11

Now, you'll need to get the SENSOR
close to Sheldon's room.
The Big Bang Theory Season 1, Episode 11

HOWARD:
Told you the SENSOR would work.
The Big Bang Theory Season 1, Episode 11

to activate the motion SENSOR.
The Big Bang Theory Season 5, Episode 2