How Nest Protect lets you know it's working
Nest Protect automatically runs a Self Test, where it checks its batteries and sensors every 200 seconds. Once a month, Nest Protect can also perform an automatic Sound Check to test its speaker and siren. And you can run a full Safety Check-Up at any time so you know your Nest Protects are interconnected and so you can listen to the speaker and siren for yourself.
Check the Nest app on your phone to see the most recent information available about Nest Protect. If there’s a problem, the Nest app will show you what's wrong and tell you what to do.
Battery powered Nest Protects send information to the Nest app once a day, while wired 120V Nest Protects check in every 30 minutes.
Here are some other ways you can check Nest Protect:
Nightly Promise: When you turn out the lights, Nest Protect will glow green briefly. If there's a problem, it will pulse yellow and it may also speak up to tell you what's wrong.
Safety Checkup: You can run a full Safety Checkup any time. The test will take a few seconds to complete, and it will be loud. At the end of Safety Checkup, the Nest app will let you know that everything is working or if there's a problem
On your Nest Protect: Press the Nest button. The blue light should turn on and it will speak to you. When it says "Press to test," press the button a second time.
With the Nest app on a phone (2nd generation Nest Protect only): On the Nest app home screen, select your Nest Protect. At the bottom of the screen, tap CHECKUP.