Smoke Alarm Battery Chemistry Not Applicable Battery Location Not Applicable Battery Locking Pin No Battery Size Not Applicable Communication Protocol Not Applicable Compatible With 2 Wire Fire Alarm System Detector Type Smoke Detector Features Drift Compensation and Smoothing Algorithms Dual-Color LED Thermal Sensor Includes Mounting Base Number of Tandem Detectors Not Applicable Power Source Hardwired Sensor Type Photoelectric Visual Alert Type LED Volume Level 85 dB @ 10 ft