Combustible Gas Detector Detects Acetaldehyde Ammonia Benzene Ethane Ethanol Ethylene Formaledhyde Hexane Hydrogen Hydrogen Sulfide Iso-Butane Methane P-Xylene Propane Toluene Measuring Range 0 to 6 400 ppm Audible Vibration Visual Indicator Features Tri Mode Detection for Visual Audible or Vibration UL Listed Battery (4) AA Includes Battery Manufacturers Warranty Length Lifetime