Carbon Monoxide 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 CO Detector Features Six Year End-Of-Life Timer Low Current Draw of 20mA in Standby and 40mA in Alarm Full UL 2075 Compliance Includes (4) Mounting Screws Number of Tandem Detectors 2 Power Source Hardwired Sensor Type Electrochemical