First Alert BRK RM4 Smart Relay for First Alert

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About This Activates auxiliary devices when alarm device sounds Works with compatible BRK and First Alert smoke, heat, and carbon monoxide detectors 120V AC powered Enhances the ef fectiveness of your detector alarm Great for adding a strobe light, siren, bell, door closer, or similar device Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety Overview Connector Type : [Proprietary] Contact Type : Normally Open Mounting Type : Door Mount Brand : First Alert Operation Mode : Automatic Show more