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.

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