Necessity, but last less than 10 yeqars
Purchased this particular smoke alarm again because it was a direct replacement and I didn't have to change the mounting ring. The first one I purchased only lasted 3 years before it started to chirp indicating replacement. It is a good alarm, easy to mount, but don't expect to leave it in place for 10 years.
Easy To Install and test
This unit was very simple to install. Has a test button built in to make sure its working. Has a red blinking light also to show its active. Don't even notice them in the rooms I put them in. I installed 6 of these units in my home. The 10 year life span is a big plus for me, I always forgot to replace batteries on the cheaper models yearly. This will make life a little simpler and safer. I marked dates on bottom of my unit the day I installed them.
One of Three DoA But Good Store Replacement Procedure
Bought a 3-pack online with in-store pickup. Installed two and the third failed to test, as was apparently DoA. Brought the one unit back to the store and they replaced it efficiently and easily. Be surprised if I actually get 10 years out of these batteries, but check for my update in a decade!
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