What is this sensor?

[Stephen H]

There is a sensor on my bus that is crushed and I do
not know what its for. Apparently someone did not like this electronic
device, because it has been smashed..??$^*#$@#

My hunch is the "panic button" Buzzer in the kitchen.? It is to the
right of the florescent Light above the sink. When I hit the 'panic
button' nothing happens. However, could be wrong... I have posted a
picture under "files section" that I will delete in a day or so if you
can check it out.
Thank you,
Stephen
81 FC-33SB
Plant City, FL