Learn more about 1st generation Nest Protect sensors

The 1st generation Google Nest Protect has multiple sensors that allow it to know what’s happening in a room and detect dangerous levels of smoke and carbon monoxide. Its sensors can detect occupancy so it can light up your path at night and help improve Home/Away Assist if you also have a Google Nest Thermostat.

Nest Protect uses information from its sensors to detect potential threats in your home:

  • A photoelectric smoke sensor uses light to detect smoke particles in the air.
  • A carbon monoxide sensor detects carbon monoxide, an odorless and colorless gas.
     Learn more about carbon monoxide >
  • A heat sensor allows Nest Protect to detect sudden rises in temperature. If Nest Protect senses a rapid rise in temperature, it becomes more sensitive to smoke. You get an earlier alert, and more time, to handle an emergency.

In addition to protecting you with three safety sensors, Nest Protect includes a humidity sensor, as well as activity sensors that light your path at night.

  • Occupancy sensors detect movement. When you walk under Nest Protect, it will to turn on Pathlight and light your way in the dark. And if you have a Nest Learning Thermostat, the occupancy sensor also helps with Home/Away Assist, so you can save energy while you're gone.  
    Learn more about Pathlight >
    Learn more about Home/Away Assist >
  • Humidity sensor enables Steam Check. This Nest Protect exclusive feature uses an advanced software algorithm to reduce nuisance alarms caused by things like steam from your shower.
    Learn more about Steam Check >
  • An ambient light sensor lets Nest Protect know when you've shut off the lights for the night so it can automatically turn on Nightly Promise and Pathlight. Nightly Promise will glow green to let you know everything's working or yellow if something needs your attention.
    Learn more about Nightly Promise >
    Learn more about Pathlight >
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