What type of smoke alarm is this? Is it even a smoke alarm?

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My house was built in 1998. There are three smoke detectors(?) in the master bedroom, bathroom, and office. My home already has smoke detectors in all the required areas, but I don’t know what these smoke detectors are, if they even are smoke detectors. Thanks in advance

Could be a CO alarm. I don’t recognize it but you can always pop it off the ceiling and take a picture of the back, there’s probably a model number and other info on there that will help us out. It’s definitely either a smoke or CO.