First Alert 0827B Ionization Smoke Alarm with 10-Year Sealed Tamper-Proof Battery

After having for a week, no problems. Just pull red tab and screw into provided mount. I used my original mount to screw in, The testing feature works fine. The red light flashes intermittently to ensure unit is working. No false alarms so far. However, I don't think battery will last 10 yrs based upon other reviews but even if it last 5 yrs I''l be happy knowing that I can forget about it until the unit beeps for replacement. I replaced my detectors because the plug in electrical ones that came with the house always beeped like a bird every time the power went off and would not reset properly.

I like the loud sound as it would awaken me when napping or in the night in another room. It does, however, need to be replaced before 10 years. My last one started beeping constantly at a little over 8 years to let me know it needed to be replaced. I liked that.