this post was submitted on 14 Sep 2026
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I just went through this battle and ended up ordering a set of sensereo MS-1 (matter over thread and home assistant ready) to replace the battery-only detectors in our basement. Our main floor is nest protect hard-wired.
While this product isn't UL certified, it is EN certified and the functional difference seems to be 85db at 3m vs 10ft. And their website says they're working on a UL certified model.
They do have a hard-wired interlink model too: https://sensereo.com/ms-1-interlink/ but that's smoke only. And again EN certified but not UL.
But at least it's an alternative to the x-sense products.
The reviews of the official replacement (FA SC-5) are mixed to awful.
We had a protect die with like 5 years of EoL left, and got the SC5 (wired). It's fine, but it should be like a third of the price. Beyond nest compatability, it's a basic fucking detector that appears to use a modified protect shell with shitty components, comparatively. But I didn't have time to look at other options, so I figured I'd try it.
Their app is outsourced too, connecting to a different company's aws east server, which I had to whitelist on my DNS. The app is trash, and it's stupid that you need it for setup - they should have just made it 'press this, chirp for connected'. The app tries hard to get you into their (or the outsourced company, I'm not sure) ecosystem. It's fine, but it's not good.
After installing I looked at alternatives for next time one dies, and for the US/NA market, Home Assistant compatability + interlink + dual smoke and co2 + being zigbee/z-wave/matter just doesn't exist. Which sucks, the protects are great (ignoring the fact that they seem to die early for me, that's the fourth unit that failed prematurely in the last decade). So unless someone makes one that checks all the boxes for me, I think I'll have to buy another from first alert.
I did briefly look at these, from what I can tell these are still battery only correct?
From their webpage: Power Built-in 7-year detection battery + replaceable CR123A module battery
Yes the MSC-1 is battery only. There is another part number that is smoke only and interlink/hardwired.
Sidenote: you can click through for the UL x-sense products here.
Thanks for the UL link, I was looking for some way to search for those briefly.
Edit: I didn't see the XP0J-SA listed in any of those unfortunately
this part from their website is for the MS-1 interlink product page, so I think those are still battery only unfortunately.
Blast my addled brain. I swear one of their products was hard-wired.
Good luck on your hunt and let us know where you land!