Large decibel: 150db 15 Inches Chrome Zinc Double Air horn kit. Powerful COMPRESSOR: coil, vacuum chrome plating, fast response. LOUD AND POWERFUL: Our truck air horn will emit nearly 150DB sound, distinguishing different truck horns, attracting the attention of people around, making driving more . EASY TO INSTALL: Each 12v/24v air horn is equipped with a custom safety relay kit, and the horn is very easy to install. You only need to connect the wires from the positive screw terminal fitting to the speaker cable or the horn switch mounted on the instrument panel, then wire the wires to Ground (negative line) VERSATILITY: Fits on Any 12/24 Volt Vehicle Car, Truck, SUV, Motorcycle, Yacht, Boat, off Road Vehicle, Busses etc Decibel: 150db Suitable for: Any 12V vehicle car, truck, wagon, bus and boat Material: High quality chrome ZINC small (no rust) Voltage: 12V/24V Material:Metal colour:silver Package Contents: 1 set x air horn for car Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.