The Dragen "Blood" Car Air Horn Kit, like all the other Dragen kits, it's unbelievably LOUD!  This train horn kit hits decibel levels up to 157dB.  This is a full blown set-up, just see everything that's included below:

• 24.5" Long Premium Chrome Air Horn 
• Viair Compressor With Tank
• 12V Air Solenoid
• Horn Activation Button
• Fittings & Poly Tubes

1 Year Warranty is included with this product.