Carbon Monoxide and Smoke Alarm Battery Chemistry Lithium Battery Location Not Applicable Battery Locking Pin Yes Battery Size 3V Communication Protocol Not Applicable Compatible With Not Applicable Detector Type Smoke/CO Detector Features Low Profile Design Tamperproof Sealed Alarm Silence Feature Includes Battery Number of Tandem Detectors Not Applicable Power Source Sealed Battery Sensor Type Electrochemical Photoelectric Visual Alert Type LED Volume Level 85 dB @ 10 ft