The First Alert Tamperproof Smoke Alarm with 10-year Lithium Battery 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 10 years once it is installed; eliminating the hassle of battery replacements for the life of the alarm. The mute feature silences nuisance alarms from cooking smoke or shower steam. Single button also tests alarm functions. 10-year limited warranty. Meets UL standards.