Truck Horn Kit, High Volume Air Powered SoundA High Volume Vehicle Horn This train style horn is designed to deliver a high volume sound from a compact unit. It is intended for safety, helping to ensure you are heard by other drivers and pedestrians in various traffic situations. It is an option for trucks, SUVs, motorcycles, boats, and passenger cars. Integrated Compressor Design This horn features an integrated mini compressor and a snail style build. This design produces a train like sound