There’s no outlets on the wall in that hallway.
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It looks like the cord is going into another room.
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That is some kind of Smoke Sentinel as far as I can remember. @PhotoElev has a linecord version.
That’s an NICO 
Printed text
I have no idea the model numbers of these things
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Could also be a Cassidy Engineering Gard-Site (which the Notifier Emhart 092-615 is based off of).
As Will said, that’s an early Smoke Sentinel.
Likely a 101 going by the lack of the silence button that the 105 has.
Could also be the battery-powered version, the TC89B.
Oh? There’s a different model number if there’s text printed on the unit’s cover instead of molded into it? Alright then…
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I normally don’t really collect residential, but I recently got a MaserGuard MG-300. Needs a new bulb but y’know.
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Btw I think those are ultra rare!
@V.S.A.M!!! You’re holy grail.
Right you are: heck I believe that’s one of the rarest Masterguards around!
Pulled out the bulb used for the alarm indicator and that bulb worked. So basically I took out the original bulb in the sensor and replaced it with that and this unit works now (doesn’t indicate it’s in alarm but there’s a horn for a reason)
Alright, because I can, here’s my MG-300 with its cousin, the Vulcan SRO-4. Internally they’re the same unit except the board is not circular on the MG-300 (don’t think I need to explain that one). I would transfer the bulb from the MG-300 to the SRO-4 to get the SRO-4 working for one shot, but the way the bulbs like to come out on these is being rocketed across the room, and I don’t feel like breaking a working bulb.
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That’s a Smoke Sentinel by Pyrotector, Inc. (not sure of the exact model however).