Title: Works....for about 2 years
Product review: I have purchased three of these (one a replacement) and they appear to work fine. Assuming it works(?) the actual numeric display of the level of CO in the air is reassuring (removes the "well, no alarm, so I guess it's working" doubts). My only issue has been with the product lifespan. Two units worked for only about two years, then displayed error messages which indicate the units had to be replaced. They're not exactly cheap, so replacement is expensive. After 5 years, I would expect to have problems; malfunctions after 2 years...something's not quite right.
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