BRK First Alert OneLink Wireless 120 volts AC / DC smoke detectors SA520B
The Firs Alert BRK Wireless 120 volts AC / DC powered smoke detector has interconnectivity and can wirelessly with up to 18 alarms in the house and if you OneLink, sounds all sound for increased protection around the house. 120V AC wired to easily replace existing wired with an alarm, and then add OneLink SA520B OneLink battery operated alarms connect to wireless alarms with wired alarms - if you sound any sound. Battery backup provides continuous protection for added security
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