The performance of the c 02 detector and smoke detector seemed great, but the mounting of them was a nightmare. The receptacle outlets in my house work a 16th of an inch below the drywall that made putting the included mounting plates on impossible so that the smoke detector would attach to it. Had to get a mounting plate to go over the existing receptacle and then mountain and connect the smoke detector to that. The plugs for the smoke detector.
Were unique and I could not find an adapter that would fit for. Had to fashion my own adapter. What should have been a 2 to 3 hour install took 2 weeks between ordering 3 orders on Amazon. Wish I had returned them when I started having problems

I replaced the year 2004 smoke-only detectors in my brother-in-law’s house. They are sharp looking! Added heat detectors to the garage, kitchen and attic. Added water leak sensors to the laundry room and bathrooms! Now, I'm just waiting for a “listener” or “relay” to tie the hardwired sensors to the hub.

I wanted long lasting detectors so the alarm wouldn't sound within a short time frame. The only problem is the green light on the detector in the bedroom. It's way too bright.

An upgrade from standard “smoke detection” devices circa 2000. Appreciate that it detects carbon monoxide also!

Bought these to replace my old units that had reached the end of their lifespan. I have to say, these are probably the best detectors I've come across. I needed ones with electric power, battery backup, and voice alerts, and these have it all.