2 * First Alert SA511CN2-3ST One Link Voice Smoke Detector
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We have these and like them. I think there was a battery problem or something on some batches discussed previously, but we have had no such problems. There is something a bit weird/comforting about your 2nd floor detector telling you there is carbon monoxide above limit in the basement. Colonel Mustard is in the Library, etc
My friend had one of her smoke detectors fail last week. Because hers are linked like these, the one that was false alarming caused the rest to alarm too. So this link-up technology is a two-edged sword.
Walmart has the combo smoke alarm AND carbon monoxide version for only 29.99, so 2 would be 59.98 - a penny cheaper - and they also are able to detect carbon monoxide which the Woot version does not! Plus you get FREE ship to store. Even if they don’t talk to each other wirelessly, they still offer twice the protection.