These units communicate with each other via bluetooth. It also helps if you have a strong wifi and bluetooth network within your home. The bluetooth link to the homekit home hubs (ble) is always on, though.

These devices tick all of those boxes, and they blend unobtrusively into the ceiling. The voice announcements are similar to what i am accustomed to with the nest, although the sound quality is not as crisp.

Setup your np's all in one place in close proximity before mounting. Mounting is straightforward and the moment you twist the detector onto the mount, the detector comes to life speaking to start the setup.

Reliance on a central server that doesn’t work right is unforgivable. After several months of trying to isolate the failing units. Called support to get a replacement. Was informed that the malfunctioning unit would be covered under warranty but that ...  Read More

There is a major issue with these and firstalert needs to address them or reimburse the hundreds of dollars they cost. The manufacture has the market locked up.

No sound. No led lights. Last updated one week ago. Without the announcement i am not sure how to even know which one is the culprit.

It takes multiple attempts to physically silence the unit. Disconnect it from the wired, nothing. Find a screw driver and disconnect main battery supply - ahhh relief and silence. Fyi, it’s still chirping away in the trash can in the am.