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Feature: ★ This unit is a photoelectric smoke alarm. The photoelectric technology ,it is more sensitive in detecting slow smoldering fires which generate light smoke, little heat and may smolder for hours before bursting into flames. ★ This smoke alarm dose not contain any radioactive material.Smoke alarms should be installed in every room (except the bathroom and kitchen),finished attics and basements, making sure the people in the home will be able to hear and respond to the alarm sound. Product Description: power:DC 9V battery Operation current: