Do unused carbon monoxide detectors expire?
I have a Kidde carbon monoxide detector: date of manufacture 2012. Until today it had never been taken out of its box, used or activated. It says on it to replace 7 years after installation and has a space to write the date installed. My son has taken it home with him because his has given an end of life bleep, and needs to be thrown away. He's put the batteries in mine and tested it as per the instruction book, and he says its working fine. But I'm worried because I can't seem to find out anywhere if it's safe to use if it's never been activated. I don't understand how these things work so would love some advice.
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