The First Alert P1010 atom 10-year smoke and fire alarm provides maximum protection while showcasing a micro design that adds an element of style to safety. This photoelectric alarm is a fraction of the size of a standard alarm and provides all the necessary protection to help keep your family and your home safe. This unit has an advanced smoke entry system with a photoelectric sensor that will detect regular and slow, smoldering fires and reduce false alarms that result from cooking and shower steam. The 10-year atom has a loud 85 dB penetrating and powerful siren to ensure everyone is out of the building safely. During an alarm, you will hear a loud, repeating horn pattern and an LED light will flash rapidly. The 10-year atom also features a near effortless installation process by utilizing a smart clip mounting system that can easily be attached to any wall or ceiling.