The First Alert Photoelectric Smoke Alarm 2 Pack is a reliable and essential home security device that provides peace of mind against potential fires. These new and sealed alarms are powered by batteries and feature a photoelectric smoke sensor for early detection. With a white color and a loud 85 dB operating sound rating, these smoke alarms are designed to protect you and your family in case of emergencies. Plus, with free shipping included, you can easily install these reliable alarms in your home to ensure safety and security.