Title: How do I know?
Product review: I've had this item for many months now and it seems to work as advertised. Has shown some minimal CO readings in my home at times and has sounded the low battery alarm recently to alert me to replace the batteries.Bottom line is:1. If it sounds the alarm and there is a HIGH CO level, then it did its' job2. If there are VERY HIGH CO levels and it does not sound the alarm, then I guess I'd give 0 Stars but I wouldn't be able to do that because I'd be dead :(
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