Nest Protect is a terrible buggy product
"If Nest Protect detects emergency levels of smoke, it will sound an alarm that can’t be hushed, by regulation."https://nest.com/support/article/What-types-of-alarms-can-I-...(Yes, I know the smoke detection was a malfunction, but occasional malfunctions like that are a fact of life. My ire is directed at regulators forbidding users from silencing their own smoke detectors without physically incapacitating them -- what were they thinking!?)