Description This compact size snail air horn will produces a loud powerful sound The integrated solenoid valve is compatible with 12 volt power sources The compressor and bracket are made of metal while the trumpet features a strong durable plastic An on board air system is required for operation Designed for installation in the engine compartment of buses coaches and trucks but can be also used on any vehicle where space is limited Specifcaition Single Trumpet Snail Air Horn 01 Voltage DC12VMaterial MetalColor BlackSound Output 126dB12V Integrated SolenoidWeight 706g Double Trumpet Snail Air Horn 02 Voltage DC12VMaterial MetalColor BlackSound Output 130dB12V Integrated SolenoidWeight 1841g Package Included 1 X Snail Air Horn