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BRK - Smoke Alarm 120V with Battery Backup - 9120B

AC Powered Smoke Alarm With Battery Back-up. If AC power fails, the battery back-up keeps the smoke alarm working. Can be interconnected with up to 11 additional smoke alarms and 6 compatible devices like bells, repeaters or switches.

FireX - Smoke Detector 120V with Battery - 4518

Firex 4518 Smoke Detector Smoke Alarm Ionization AC Powered Smoke Alarm with Battery Back-up and False Alarm Control for single or multiple station use.

BRK - General Use Smoke Alarm - 83R

An affordable way to add additional smoke alarms to any home safety plan. Full size smoke alarm has a 5" base. Great for RV applications!