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Review title: Designed to fail after five years
Product review: I am on my third round of having to replace the Kidde KNCOSM-IB combo smoke/CO2 detector. I have eight of these detectors wired together, so it's not cheap. The failure mode is an annoying chirp every 30 seconds. This is the designed-in failure mode to force you to replace your detectors every five years. My store-front retailer told me they sell thousands of these as replacements on a regular basis. On the first round, I thought they failed to quickly so I wrote the replacement dates on the second round, sure enough, five years later, they are all failing again. I'm going with another brand this round.
