Features easy, snap together assembly. Marine environment tested for salt water spray, shock, temperature extremes, vibration and corrosion. Power 12 vDC, operational range 7-16 volts. 200 milliamp (.2 amp.) current draw. Fumes Detected: Gasoline, hydrogen from batteries, propane, alcohol, acetone, methane and other explosive vapors. Fire Alarm Trigger: 180° Thermal Switch. Flood sensor triggers during high bilge water conditions. On/Off/Test Switch. For one touch analysis of detector performance. Size: 3-1/4"W x 2-3/4"H x 3/4"D.