Home safety

I just purchased our fourth Nest smoke and carbon monoxide alarm for our home. As our old Home Depot smoke alarms go kaput one by one, I have replaced them with the more expensive, but superior, Nest. They seem to last longer, are smarter, less annoying, and are networked via wifi. In theory (no actual disasters yet), each Nest will broadcast a concern it detects to all the others, so a fire in my downstairs home office would be announced in a message by the Nest in our living room. It also sends alerts to my phone if I am away. — KK