Usage Tips:Our 1105DB train horn delivers a very loud sound while being one of the most compact train horns available. The Train Horn is a premium, train horn kit designed for s fit into as many trucks as possible.Train Horn is suitable for almost all vehicles While itand 39;s the perfect upgrade for trucks, our horn is also compatible with SUVs, passenger cars, boats, and motorcycles.Made from quality metals and non-oxidizing ABS construction. Simple installation. Discreet and compact black design. Complete water and weather resistance. Loud, clear and deep sound similar to that of a train.Our horn features an extremely powerful direct-injected mini-compressor combined with a patented snail-shaped design to really charge and amplify the soundAll integrated into one small but powerful device There is no bulky air compressor, just a small device that produces amazing sound It is so compact that many customers purchase and install 2 horns to overtake volume"