Pushbutton switch. Uses 6-volt alkaline or carbon-zinc lantern battery. Use with PR13 bulb only. Approved by U.S. Dept. of Labor, Mine Safety and Health Administration for use in Methane-Air mixtures, and No. KPR-113 (Rated at 4.8V, 0.75A). U.L. Listed for use in Gas-Air mixtures of Class1, Groups C and D including Diethyl Ether, Natural Gas, Acetone, Ethyl and Methyl Alcohols, Naphtha, Gasoline, Propane, Butane and Benzine. WARNING: Use only indicated bulbs. DO NOT use halogen or superbrite bulbs becausetheir breakage could cause explosion causing serious personal injury. Use only indicated battery types. See product carton for details.