Specification: -100% quality assurance tested, more responsive, less expensive, easier to install. -Suitable for cars, trucks, boats, motorcycle, any 12V vehicles. -Single trumpet, no air system needed. -Easy to fit, glistening chrome finishing and tuned train horn sound. -Attachment screws and brackets included. This air horn can fit in almost any vehicle, and deliver the big sound you need. Although it is a small size air horn, but provide a very loud sound. These kits are a great way to give that loud, bellowing sound without taking up a great amount of space. Product introduction: 1. Voltage: 12V 2. Sound level: 105(db) 3. Power: 48(W) 4. Impedance: 0.5(Ω) 5. Length ：450 mm 6. Main material: Zinc alloy 7. Surface finish: chrome coated 8. Frequency: 450 Hz 9. Working temperature: -20-80(℃) 10. Water proof: IP65 Package Includes 1 x train horn for car 1 x compressor 1 x air hose 1 x mounting hardware kit 1 x relay 1 x wired relay plug