The most common sources of CO are malfunctioning or misuse of gas appliances used for heating & cooking vehicle engines electric generators blocked chimneys or flues portable burning heaters fire places fuel powered tools & operating a grill in an enclosed space The mains powered carbon monoxide alarm can be wall mounted or free standing Digital display of CO levels Mains powered Battery backup battery supplied Peak level memory BSI 50291 Cenelec standard Kitemarked Flexible mounting locations Wall mount Plugged directly into wall socket Free standing 85db alarm Bracket included Test Reset button Battery type 9v 5 year warranty Appliance only