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These alarms have a useful life of about 10 years and they deteriorate even if they are still in the box, uninstalled. There is a mfr date on the underside of each unit. I would consider anything over a year old to be unacceptable. The alarms I received were FRESH! (only about 6 months old). This means I will get maximum life from them - an important thing for a home safety product. They have a proven record of being a reliable detector (I had only one premature failure among my five detectors during their 9 years of life - and it alerted me to the fact it was having problems. Replacing my detectors was easy: Installation required only a step ladder and a phillips screw driver. It took only two or three minutes per detector and I was even able to reuse the old connector wires so I did not have to mess with any electric connections other than plug out - plug in! Nice!Read full review
Verified purchase: Yes | Condition: New
Easy install. The old 110 volt plug connected directly to the new alarms.Only had to change the base.
Verified purchase: Yes | Condition: New
Because my house is wired with same smoke detectors, it made it compatible and easy to install main unit without having to replace entire wall plate and harness. Am looking forward to another 10 years or so worry-free detectors just like the ones they replaced.
Verified purchase: Yes | Condition: New
Great product easy to use Easy to install. Had to change the wiring harness but it only took about two three minutes for each one
Verified purchase: Yes | Condition: New
The smoke detectors were very easy to install and even came with a high-quality 9 volt back up battery. I am very happy with my purchase!
Verified purchase: Yes | Condition: New