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BRK Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector

First Alert BRK Hardwired (with Battery Backup) Ionization Interconnected Combination Smoke and Carbon Monoxide Detector

4.5
651

Do these units have more than 1 battery ? With power off and 9 volt removed some chirped ?


Thank you for your question. The unit only has one battery. The unit is a hardwired unit that has a 9 volt back up battery. The back up battery is designed to provide coverage for a short time in the event of a power outage. It is not recommended, but the unit can chirp and communicate without the backup battery.

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