The Kidde 10SCO is a battery-powered combination alarm that offers protection from the dual dangers of smoke and carbon monoxide (CO) in a single unit for convenience. Its voice alarm feature audibly announces which danger has been detected. The alarm has a peak level memory, which provides notification (voice and LED) when dangerous CO levels have been previously detected. Its front loading battery compartment makes changing the battery easy and convenient. The 10SCO has a Hush™ button to temporarily silence nuisance alarms. It also has a test/reset button to allow regular testing of the alarm function. Designed to be wall or ceiling mounted, this battery-powered unit is perfect for when space is limited but protection is paramount. It can be used in most locations throughout the home. BSI certified to EN14604:2005 (Smoke).BSI certified to EN50291-1:2010 (Carbon monoxide).CE tested and certified.