We tested 12 models to see which respond fastest to smoke.
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The Warehouse only.
Was already installed in our house when we bought it.
Problems started about one year after moving into our new house (probably when the original batteries started to run low). Our first one of these alarms started going off at random, when there was no cooking or anything going on, so had to take it down. Perhaps summer humidity set it off. Then some weeks later, the second one (in a bedroom) started false alarming constantly. New battery made no difference in either case.
Do not buy these, they're obviously cheap for a reason.
No, this product has too many drawbacks.