The Kidde 20SA10 4-Pack Smoke Alarms with Battery Backup are a reliable and essential home security measure. These white smoke alarms are hardwired for power and come with a 10-year battery backup, ensuring continuous protection even during power outages. The interconnectable feature allows for easy installation and enhanced safety by connecting multiple alarms throughout your home. With a manufacturer warranty of 10 years, you can trust in the durability and quality of these smoke alarms for years to come.