Carbon Monoxide 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 CO Detector Features Tamperproof Sealed Alarm Digital Display Silence Feature End of Life Signal Includes Battery Number of Tandem Detectors Not Applicable Power Source Sealed Battery Sensor Type Electrochemical Visual Alert Type Digital Display Volume Level 85 dB @ 10 ft