Swapped out all the smoke alarms in the house with Nest Protect 2G units. They talk to you, which is a little weird. Hopefully they're not also listening -- no mic in the specs but who knows in these paranoid days? Anyway, now have the outside security cameras and indoor thermostats and smokes all accessible on my phone in one app, which I like. Probably would have preferred to use Apple HomeKit as a platform, but the device ecosystem isn't there at the moment.