Gasoline Propane fume detector. Remote sensor monitors, bilge engine compartment. Audibles and visual alarm. On,off test buttons. 12 volt with 200 milliamp draw. Dimensions: 3 1/4"W x 2 3/4"H x 3/4"D. Comes with 20ft Quick Connect Cable. Fumes detected include gasoline, hydrogen, propane, alcohol, acetone, CNG and other explosive vapors.