The Kidde Firex KF20R is a reliable mains powered optical smoke alarm with a rechargeable lithium back-up battery, ensuring continuous protection even during power outages. With a manufacturer warranty of 6 years, you can trust in the durability and quality of this alarm. The sleek white design and smart home compatibility with X10 make it a practical and stylish addition to any household. Built by the trusted brand Kidde, this smoke alarm provides peace of mind for you and your family.