Smoke Alarm Battery Chemistry Not Applicable Battery Location Not Applicable Battery Locking Pin No Battery Size Not Applicable Communication Protocol Not Applicable Compatible With 4 Wire Fire Alarm System Detector Type Smoke Detector Features Removable Detector Cover and Chamber Built-In Remote Maintenance Signaling Drift Compensation and Smoothing Algorithms Thermal Sensor Includes Mounting Base Number of Tandem Detectors Not Applicable Power Source Hardwired