First Alert Interconnect Hard-Wired w/Battery Back-up Ionization Smoke Detector 1 pk Drywall Saws Increased wall thickness improves durability

Increased wall thickness improves durability and minimizes tooth loss when cutting metal

Super holding power

Writeable-erasable latex paint formula dries hard with slate-like materials that promote easy cleaning

Double-fin for better seal

First Alert Interconnect Hard-Wired w/Battery Back-up Ionization Smoke Detector 1 pk Drywall Saws Increased wall thickness improves durabilityThe First Alert SMI105 AC Interconnect Hardwire Smoke Alarm with 10 Year Battery Backup uses First Alert's Precision Detection advanced sensing technology and meets new industry standards. Interconnect multiple alarms together to help provide an early warning throughout your whole home and have peace of mind knowing the 10 year battery backup provides continuous protection in the event of a power outage. First Alert's Precision Detection advanced