Image credit: NestProducts with Google Assistant like the Google Home, Google Home Mini and the Nest Cam IQ with Google Assistant can let you know
when someone's at the door. You can also ask Google Assistant to cast the doorbell's live video
stream to a Chromecast equipped TV. This even worked with my first generation Chromecast, although it took some buffering as all video tends to do on a first gen Chromecast. If you've subscribed to Nest Aware, you can even have your compatible smart speaker announce people by name, assuming they're recognized by the Nest app. I'm a reluctant smart speaker user, so I found this weird at first. But it's also the closest my house has come to the McFly house in Back to the Future Part II, welcoming home every family member by name. The Nest Hello also works with the Nest X Yale smart lock, so that you can lock and unlock your door using your smartphone and assign codes to guests. However, you can't use your voice to control it with Alexa or another voice assistant as you can with August's and Schlage's smart locks. MORE: Know Where Your Kids Are With These GPS TrackersWhile some Nest products such as the Nest Learning Thermostat, Nest Protect smoke alarm and Nest Cam have IFTTT support, as of this writing, the Nest Hello does not, although some Nest Cam recipes do work. Nest Hello's facial recognition seems like a natural fit for this kind of automation — imagine setting different rules for different people — so we hope it comes along eventually. Bottom LineThe facial recognition feature in the Nest Hello gives this video doorbell a more personal experience than the competition.
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Also, with a security provider, "you have someone to contact should your system have any kind of service issues," Walters says.
The way this type of detector works is that it uses a light source can be infrared, ultraviolet or visible which points away from the sensor, but, in the event of smoke entering the small chamber, the light particles will be scattered, therefore, some will hit the sensor and trigger the alarm.
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