SA-340 Black RV Battery Powered CO Detector – RectangleFeatures:Sealed-In Lithium Battery – No Replacement Needed!5-Year BatteryReplaces Battery Powered RV Listed CO Alarms Long 5 Year Battery LifeEasy InstallationLow Battery IndicationBuilt-In Test/Hush FunctionsApproved. Meets RVIA/NFPA requirementsEnd of Life Signal. Provides audible confirmation when alarm needs to be replaced, with 30 day override (see owners manual). Replacement date is 60 months (5 years) after pulling battery tabConforms To ANSI / UL STD 2034