The First Alert 1039765 (model P1010) is a 10-year sealed lithium battery-powered mini smoke alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotel/motels, dormitories, and other multifamily dwellings. P1010 is a state of the art photoelectric micro smoke alarm designed to provide early warning of a fire. It features a fully insect screened photoelectric smoke sensing chamber, an 85dB horn, a sealed 10-year lithium power cell, a full function test switch, a silence feature, and a LED light that indicates DC power or alarm. The sleek, micro design (as tall as a paperclip) complements any décor. The P1010 is part of the 10-year alarm assortment which provides hands-off, care-free devices that contain a decade of protection. This product eliminates the need for numerous battery replacements throughout the life of the alarm. Perfect for additional smoke protection needed. 10-Year Limited Warranty.