Carbon Monoxide and Gas Alarm Battery Chemistry Alkaline Battery Location Back Battery Locking Pin No Battery Size 3V Communication Protocol Not Applicable Compatible With Not Applicable Detector Type Explosive Gas/CO Detector Features Direct Plug In Samples Air Every 2.5 Minutes Peak Level Memory Includes Not Applicable Number of Tandem Detectors Not Applicable Power Source Sealed Battery Sensor Type Electrochemical Visual Alert Type LED Volume Level 85 dB @ 10 ft