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BRK Electronics CO5120BN Hard Wired T4 Carbon Monoxide Alarm with Backup

The BRK CO5120BN is a hard-wired carbon monoxide combo alarm with battery backup. It features a CO sensor, Intelligent Sensing Technologyトᄁ for fewer unwanted alarms, an 85dB horn, 9V battery backup, side-load battery drawer, two silence features and is interconnectable with up to 18 devices.