Is this a smoke detector or sensor?
- elhighLv 72 months agoFavorite Answer
Smoke detector. Very common commercial model. I have many in my building.
- champerLv 72 months ago
Looks like it, yes.
- Anonymous2 months ago
Both, a detector and sensor are the same thing. It will activate the fire alarm if it senses or detects smoke beneath it. If the ceiling void above is very deep there will be another detector in there as well.