First Alert 1039852, Battery Photoelectric Sensor Smoke Alarm

First Alert 1039852, Battery Photoelectric Sensor Smoke Alarm Model number PR710 Low profile smoke alarm reliably detects smoke from smoldering fires Slim easy to install design is half as thick as standard smoke detectors Built in 10 year Li Ion battery offers continuous power for the life of the alarm Photoelectric sensor detects smoke while minimizing false alarms Patented smoke entry system allows for a direct path to the sensor Mounts unobtrusively on the ceiling or wall Includes mounting bracket