Title: Easy installation
Product review: I did not know that smoke detectors had a fixed lifetime. One of the units in my home (installed in 1995) began to "chirp." A battery change did not stop the chirping, and the test button indicated failure of the unit. That's when I learned that they don't last forever. None of my local sources had a suitable replacement. One dealer gave me a "close" replacement, which beeped continuously when I installed it, so I returned it. I found this item on line at Amazon. Delivery was prompt, and I replaced the 7 units in my home in less than an hour. The new ones function perfectly, and the price was right.
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