Orca's micro photoelectric smoke alarms offer incredible functionality in a smaller package. With effective detection of slow smouldering fires as well as fast flaming fires, this smoke alarm gives you and your family an early warning and plenty of time to respond. Photoelectric smoke alarms also significantly reduce nuisance alarms caused by cooking. The built-in battery does not need to be replaced during the 10 year lifespan of this smoke alarm. Ideal for living areas, bedrooms and hallways.