We tested 12 models to see which respond fastest to smoke.
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10 year lifetime, allegedly.
After approximately 2 years, both units I purchased started sounding intermittently for no apparent reason.
One just failed so badly -- the alarm sounds the moment the hush period (5 minutes) expires until I press the hush button again -- I've had to pry the cover off and sever the link to the battery to shut the thing up.
Given a number of other people are reporting the same fault, and I've had a similar issue in two identical units, I suspect this is a design fault that shows up after a couple of years.
No, this product has too many drawbacks.