The SA350B Smoke Alarm provides full 10-years of protection with its sealed tamper proof design, ensuring operation over the life of the alarm. Its 10-year sealed lithium power cell prevents battery theft and meets codes where sealed smoke alarms are required. With the Perfect Mount, this alarm allows for easy alignment and includes a single button for test/silence function. It also meets California state fire marshal's senate bill 745 requirement and comes with a 10-year limited warranty for added peace of mind.