Odd smoke detector?

[rkenney]

Has anyone seen one of these before?

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Seems to be a smoke detector, so what is the smaller unit for? A radio interconnection perhaps (same unit in basement)? Pretty ugly each assembly had a separate cover.

It wasn't hardwired so it wasn't suitable for the intended application (rental) and had no manufacturers marks or description.

[allseason]

Any test buttons? Labels?

[John Dirks Jr]

I think your guess as a transmitter for interconnecting ability is correct.

I've never seen one. Did you test it to see if it communicated with the one in the basement?

Either way, you're correct for flunking it due to lack of hard wiring.