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Title: Location Dependant?
Review: I have rental properties and I decided to upgrade all units to have monoxide detectors. I decided on this unit because it is a two in one device and it used double AA batteries instead of the nine volts. My tenants keep complaining that these devices keep beeping. I looked on the back and 3 chirps = bad detector. I took a few of them down, put up the old ones and brought them to my home. They have not chirped since. Something about the other place is making these detectors fail.Another thing is that I did not notice this but there is a 5 year life on these detectors and then they will chirp without any choice but to replace them. So even if yours works at first, you only will get 5 years out of it. I bought a total of 7 of these that cost me a few hundred and now I need to look for replacements. I wish I left all the old smoke detectors in.
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