Features: 1.6 Tunes: This musical air horn can play 6 different tunes, satisfying all your expectation from a music air horn, and immediately attract people attention. 2.Complete Kit: The kit comes with 3 sturdy chrome plated metal horn, a 6?key control button board and a connection cable, bring you more convenience. 3.Match to Use: The operation of the air horn requires an onboard air system, namely an air compressor (not included) and an air tank (not included) to work. 4.High Performance: The size is approximate 305/342/385x79mm, and adopt chrome plating process to make your vehicle more charming and distinctive. 5.Wide Applications: The high grade 3 air horn is widely used in trucks, club cars, yachts, mining carts, etc., to meet your needs with a louder sound. Specification: Item Type: 3 Air Horn_x000D_ Material: Aluminium Alloy_x000D_ Process: Chrome Plating_x000D_ Type: Air Horn_x000D_ Control Type: 6 Key Control_x000D_ Application: For trucks, club cars, yachts, mining carts_x000D_ Product Size: Approx. 305/342/385x79mm (12/13.5/15.2x3.1in)_x000D_ Voltage: DC 12V/24V_x000D_ Current: 4.0A_x000D_ Sound Level: 145dB_x000D_ Operating Air Pressure: 0.5Mpa-0.8Mpa Note: The product needs an external air source to work normally, and the original car cannot be used without an air source.