This is a review of the First Alert carbon monoxide alarm. Easy to read, shows the room temperature and is easy to use. It can be wall mounted or placed on a flat surface. It has a built-in non-replaceable battery for 10 years. You activate the battery by removing a thin strip of plastic from the body of the metal detector. Pros and Cons: When a long-life battery finally fails, it cannot be replaced. If it lasts the full 10 years as advertised, the device should of course be replaced anyway. Given that I'm still alive, I assume it effectively detects the absence of carbon monoxide in the air. If that ever fails, I probably won't be able to update this review. But now I give five stars.
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