FIRST ALERT 9120BA 120V 9120 Series Hardwired Smoke Alarm with Battery Backup

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.PRODUCT FEATURES:- Ionization Smoke Sensing Technology - 9V Battery Backup - Single Test/Silence Button - Two Locking Features - Pins are provided to lock battery drawer and/or alarm to base. - Latching Alarm Indicator - Remembers which unit initiated an alarm - 10-Year Limited Warranty