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Description:Gas sensor:solid semi-conductor gas sensordetecting gas:natural gas,ammonia,hydrogen,coal gas,lpg acetone,ethanol oxide,h2s lacquer,diluent,industrial inpregnant,alcohol,gas fuel etcgas sensitivity:<50ppm methane statrup time:<30secresponse time:<3secaudio indication:0.5-1khz,quicker buzzing frequency means higher gas concentration. Power:9v alkaline battery Weight:350g size:170x62x26mm