Description Type: Multi-tone Claxon Horns Material: Chrome Plated Zinc Alloy(Non-Rusting) Voltage: 12V / 24V Sound Level: 110-135db Features: - Suitable for car, trucks, boats, any types automobiles with 12V volt. - This air horn needs an air source which is not included. - 135db super loud. Mounting Hardware: Included Trumpet Diameter: 3.5 Short Trumpet Length: 6.2 Middle Trumpet Length: 8.8 Long Trumpet Length: 11.3 PSI: 4-6 KPa Hook up Wire Dimension (not included): 7mm / 0.28 Note: - Solenoid valve air pipe joint should be carefully tightened, sometimes blocked by the filter net in use, and should be always cleaned so as not to affect sound quality. - No Installation Instructions Included, professional installation is recommend. - This kit may require additional parts such as wiring, relays, switch, and hardware. - Each installation is custom depending on the application. Product Weight: 1100 G / 38.80 Ounces Product Dimensions (L*W*H): 200*100*50 MM / 7.87*3.94*1.97 Inches Package Weight: 800.0 G / 28.22 Ounces Package Dimensions (L*W*H): 200*100*50 MM / 7.87*3.94*1.97 Inches Retail Packaging: Yes, General Box Package include Package Including: 1 x Train Air Horn