✅Expiry: 2025. Google Nest Protect (2nd Generation) – Smoke and Carbon Monoxide Alarm –Wired Version. Google Nest Protect alarm (wired, exp. Smoke + Carbon Monoxide detection. Nest Protect is one of the smartest smoke and CO alarms available – it speaks alerts in a clear human voice, sends notifications to your phone, and self-tests to ensure reliability. ).
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