Give any truck the powerful sound of a train air horn. The SIBERIAN EXPRESS has been engineered with the latest technology using reinforced ABS plastic. The sound produced by the three trumpets is incredible. Using reinforced ABS plastic decreases the overall weight by eleven and half pounds – (11.5 lbs.) The Siberian Express weight is two-thirds less compared to the same type train horn that is metal. The reduced weight makes installation easier, ensures less vibration and eliminates the need for extra support brackets to prevent damage to the horn when driving on rough roads. The trumpets are finished with an attractive semi-gloss black finish and the mounting base is painted silver. The SIBERIAN EXPRESS requires an on-board air system with a minimum of two (2) gallon storage tank, (recommended Wolo on-board air system Model 840). Kit comes with all mounting hardware, 10 feet of 1/4” O.D. nylon high-pressure hose, and a heavy-duty 12-volt electric solenoid. Horn size: L 16-1/2 in. x W 14-3/4 in. x H 11 in - 152 Decibels – 307/347/440 Hz