First Alert SA340 Smoke Alarm With Lithium Battery 10 Years is a great choice for rental properties or areas of a home with high ceilings that make battery replacements more difficult. This alarm is sold with an insertable tamperproof lithium power cell pack that will last for 10 years after installation; eliminating the hassle of battery replacements for the life of the alarm. The mute feature silences nuisance alarms from cooking smoke or shower steam. A single button also tests alarm functions.