Carbon Monoxide and Smoke Alarm Battery Chemistry Alkaline Battery Location Back Battery Locking Pin Yes Battery Size AA Communication Protocol Not Applicable Compatible With Not Applicable Detector Type Smoke/CO Detector Features Low Profile Design Tamper Resistant Silence Feature Includes Mounting Anchors Screws Number of Tandem Detectors Not Applicable Power Source Removable Battery Sensor Type Electrochemical Photoelectric Visual Alert Type LED Volume Level 85 dB @ 10 ft