Kidde 10Y29RB Battery Powered Optical Smoke Alarm 4" 10 Year Sealed-In Battery Test/Hush The Kidde 10Y29RB 10-Year Optical Smoke Alarm has a test/hush button for regular testing of the smoke alarm function, it also allows nuisance alarms to be temporarily silenced. Key Features: 10-year long life operation – never need to change the battery Sealed-in battery never needs to be replaced End of life notification alerts you after 10 years when it’s time to replace the alarm Ramp-up Horn allows sound emitted during test sequence to be reduced to a more acceptable volume for the user Combined Test/Hush button allows regular testing of alarm function and can be used to temporarily silence nuisance alarms Battery operation – Sealed-in Lithium battery General Features: Model: 10Y29RB Power Supply: Sealed-in Lithium battery Temperature Range: 0?C to 40?C Humidity Range: Up to 90% relative humidity (RH) non-condensing Storage and Transport: -20ºC to +60ºC and 5–95% relative humidity (RH) non-condensing Alarm Dimensions: 104 x 104 x 45mm Alarm Weight: 170g Warranty: 10 years Approvals: BSI certified to BS EN14604:2005 CE tested and certified Data Sheet: Click Here for Data Sheet Instruction Manual: Click Here for Instruction Manual