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: 706gDouble Trumpet Snail Air Horn(02#)Voltage: DC12VMaterial: MetalColor: BlackSound Output: 130dB12V Integrated SolenoidWeight: 1841gPackage Included:1 X Snail Air Horn