The Wolo 841 is designed to be smaller in size so to fit into engine compartment's that have less open space. Four (4) brass triple chrome plated trumpets produce the powerful train horn sound. The Orient Express will provide the driver with comfort of knowing that he/she will be heard! Requires an on-board air system with a minimum of 3-gallon storage tank, (recommended Wolo on-board air system is Model 840). Built with a heavy-duty 12-volt electric solenoid. The Orient Express comes with mounting hardware and 10 feet of 1/4 nylon high-pressure hose. Designed to be smaller in size so to fit into engine compartments that have less open space Four brass triple chrome plated trumpets produce the powerful train horn sound Provides the driver with comfort of knowing that he/she will be heard Requires an on-board air system with a minimum of 3-gallon storage tank, (recommended Wolo on-board air system is Model 840) Built with a heavy-duty 12-volt electric solenoid UPC 080217008419 Voltage 12 Volts Fit Type Universal Fit Brand Name Wolo Style Name Horn only Item Weight 8.6 Pounds Manufacturer Wolo Material Type Brass Item Dimensions 21 x 15.5 x 5.6 inches Manufacturer Part Number 841 Compatible with Vehicle Type Truck Manufacturer Warranty Description 90 Day Limited Warranty Global Trade Identification Number 00080217008419