Smoke Alarm Battery Chemistry Alkaline Battery Location Back Battery Locking Pin Yes Battery Size AA Communication Protocol Wireless Compatible With Not Applicable Detector Type Smoke Detector Features Wireless Includes (3) AA Batteries Number of Tandem Detectors 24 Power Source Removable Battery Sensor Type Ionization Visual Alert Type Red LED Volume Level 85 dB @ 10 ft Alert Type Sound Battery Backup No Detects Smoke Humidity Operating Range Up to 85 Percent RH Hush Mode Yes