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Green and blue indicate that the alarm is starting up or in pairing mode. Yellow means there's a malfunction or a low battery, while red means there's a fire or smoke condition. Onelink's alarm uses photoelectric technology, which is generally better at detecting smoldering fires than are alarms that use ionization technology. However, the latter are better at detecting fast burning fires. The Onelink can be connected to HomeKit and Alexa but not Google Assistant, so you can ask both Siri and Amazon's voice assistant for the status of the smoke detector, but not much else. By contrast, if the Nest Protect detects fire or carbon monoxide, you can have it automatically turn on a security camera, open Lutron blinds, turn on Philips Hue lights, turn off your heat and more.alarm monitor systems
Sharp HD video. Works with Amazon Alexa and Google Assistant. Cons: Setup requires working with electrical wiring. Must have existing chime box. Need Nest Aware subscription for many features. Bottom Line: The Nest Hello video doorbell not only lets you know when somebody is at your door, it uses face recognition to tell you exactly who it is.