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The wired dual photoelectric and ionization sensor smoke alarm with battery Model #: 3120B; SKU #: 3120B; Additional SKUs Specifications & Manuals Smart Interconnect can be interconnected to BRK Smoke Alarms. One interconnect wire carries both smoke and CO alarm signals. Single Button Test/Silence INTRODUCTION. Thank you for choosing First Alert® for your Smoke and Carbon. Monoxide Alarm needs. You have purchased a state-of-the-art Smoke &.3120B Hardwired Photo & Ionization Smoke Alarm. Pallet Weight (lb): 879. » User Manuals - English Version (Original as in Box) · » User Manuals - Spanish Thank you for choosing BRK Brands, Inc. for your Smoke Alarm needs. You have This user's manual contains important information about your Smoke Alarm's. smoke alarm during power outages. CAT. 3120B. 120V AC, 60Hz Wire-in with 3V (two 1.5V AA) station photoelectric and ionization dual sensor smoke alarm specifically designed for residential user's manual for details. Smoke Sensors:. Search among more than 1.000.000 user manuals and view them online in .pdf. BRK electronic | 3120B | User's Manual | BRK electronic 3120B User's 7 Oct 2013 20 Dec 2018 Find the user manual you need for your home appliance products and more at ManualsOnline. BRK electronic 3120B Smoke Alarm User Find the user manual you need for your home appliance products and more at ManualsOnline. BRK electronic 3120B Smoke Alarm User Manual. Page 1.