9120 Collection Contractor Pack 120 Volt Hardwired Smoke Alarm with Battery Back Up, Latching Alarm Indicator, Smart Technology, Perfect Alignment Mount The 9120 Series smoke alarms have been designed to install faster, perform better and be even smarter than before. These improvements help reduce nuisance alarms and save you time and money. Features: Multiple station smoke alarms specifically designed for residential and commercial use Redesigned cover, metal sensing chamber and new integrated circuit work together to reduce nuisance alarms Perfect mount system features a gasket less base and mounting bracket that keeps the alarm secure over a wide rotation range to allow for true alignment Single button test and silence eliminates confusion Easy access side-load battery drawer, installation and removal can occur while the unit is mounted to the ceiling or wall via the side load batter compartment Battery backup power supply keeps alarm working during a power failure, providing battery is installed properly and is fresh battery theft and or theft of the unit and connection to AC power is made with a quick-connect wiring harness for installation that is quick and easy 9 volt battery included Specifications: Meets UL standards with an 85dB horn You can install BRK Brands, Inc. products with confidence! Our products are designed to save lives. It's a responsibility we don't take lightly. We build each smoke alarm, carbon monoxide alarm, heat alarm, and fire extinguisher to the highest standards. Over the years we've seen competitors come and go. We're still here, still making the most recognized consumer brands of smoke and CO alarms on the market.