My prediction for Nest's next product: a home security system.
If your home is already equipped with Nest thermostats and smoke alarms, all their motion sensors are commandeered by the central unit. No new wiring necessary.
Edit: Come to think of it, there's probably no need for a central unit, either.
If your home is already equipped with Nest thermostats and smoke alarms, all their motion sensors are commandeered by the central unit. No new wiring necessary.
Edit: Come to think of it, there's probably no need for a central unit, either.