Wolo (850 Siberian Express Air Horn - 12 Volt Electric Solenoid Activation Will give any 12-volt truck the powerful sound of a train air horn Engineered with the latest technology using reinforced ABS The horns are operated by a heavy-duty 12-volt electric soleniod valve The trumpets are finished with an attractive bright chrome finish and the horns base is painted steel Horn comes with all mounting hardware and 10 feet of 1/4 inch nylon high-pressure hose and a heavy-duty 12-volt electric solenoid valve