The First Alert SMI105-AC Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup uses First Alert's Precision Detection advanced sensing technology and meets the latest 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 sensing technology complies with the latest industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
• 10-Year battery backup provides continuous protection during power outages
• Through early warning interconnect, when one alarm sounds, all compatible* alarms will sound
• Alarm indicator visually identifies the unit that initiated the alarm
• End-of-life warning lets you know when it’s time to replace the hardwire detector
• Test/silence button for efficient testing to ensure alarm is working properly