Google Nest (S3004PWBUS) Protect Carbon Monoxide and Smoke Detector with Long-Life Battery
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Nest Protect Smoke and Carbon Monoxide Alarm — 2nd Generation (Battery)
Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home while you're away.