Smoke detector help

Hi, I just bought this on eBay for $5 (the seller says it works) and, I would like to know what it is and, is it rare.

That’s a Fire-Lite SD14A as it says on the label, which is a rebranded ESL 1025C/523C. It’s somewhat rare I’d say. Another thing to note is that it’s 6-18VDC as the label also says, rather than 24VDC like most detectors (so be sure you don’t overvolt it).

impressive how you know that

Thanks for the info!

You learn a lot of things after being in this community a while (like most).

Sure thing!