I didn't even know smoke alarms wore out but mine had an expiration date. This was an inexpensive, easy to mount, replacement and it even came with a battery.
I bought 2 of these, one worked but kept on beeping, the second one just didn't work at all. I took them both back to Sears.
Easy to install. Functions as it should.
It is just one of those regular First Alert smoke alarm you may find from many other vendors. It looks like the same as the one I bought from ******. I paid much more at ******, and had to buy the battery myself, while this unit even comes with a 9V battery, which makes it the best value option you can ever find.
Got the smoke alarm when it's on sale, to replace a 10 year old one in my home. This is a basic single sensor smoke alarm, it is easy to install, and works as described.
I replaced an alarm that was always beeping at the wrong times and hard to test.