This kidde home protect smoke alarm uses optical sensor technology and is ideal for use in the kitchen detects both smoke and carbon monoxide in a single alarm its sensors interact to distinguish between non harmful cooking fumes or steam and real fires reducing nuisance alarms powered by a sealed in 10 year lithium battery that lasts the full life of the alarm and never needs replacing when activated the alarm has a loud 85 decibel alert it is simple and easy to install thanks to its single scr