Carbon Monoxide and Gas Alarm, Battery Chemistry Alkaline, Battery Location Front, Battery Locking Pin No, Battery Size 9V, Communication Protocol Not Applicable, Compatible With Not Applicable, Detector Type Explosive Gas/CO Detector, Features Front Loading Battery, Includes 9V Battery, Number of Tandem Detectors Not Applicable, Power Source Hardwired, Sensor Type Electrochemical, Visual Alert Type Digital Display, Volume Level 85 dB @ 10 ft, Battery Backup Yes, Hush Mode Yes