General use smoke alarm for landings and stairways with a powerful lights that indicates the escape route through the smoke. Equiped with test / silence button to reduce nuisance alarms Faster smoke detection Safe and easy battery installation and replacement Unique antidust coating to protect against dust and insects Mesh 30 Day low battery warning LED light to indicate power and alarm mode Includes easy to install 9V battery (With a minimum of 1 year life) and fittings Loud 85db alarm 10 Year manufacturer guarantee CE. EN14604:2005 Approved