If you are wanting to add big rig sound to your ride, The Mother Trucker is the horn to have. At over 29" long the other drivers on the road can't mistake the classic sound. This single trumpet horn comes in a brilliant chrome finish with a high flow valve already attached for 12 or 24-volt applications.Use this product in a safe and responsible manner, at a distance of at least 100 feet from others.Proper Hearing protection must be worn when using this air horn. Hearing loss or permanent damage may result from unsafe use.Never operate this product in a closed environment or close to pedestrians or others.It is the consumer's responsibility to comply with local noise ordinances and D.O.T. sound level laws.