The product is a set of Kidde 9v Battery Operated Smoke Alarms, including two alarms and one Elpine Battery Operated Smoke Alarm. These white smoke detectors are powered by batteries, with a diameter of 102mm and a depth of 36mm. The alarms are from the brand Kidde and are designed for home security. Each alarm comes with one battery included, making it easy to install and operate in case of emergencies.