High quality and high&low Tone Loud Car motorcycle air horn. It works with ANY 12V Car， Truck， SUV， Motorcycle， Yacht， Boat， off Road Vehicle， Busses etc and has 18 different charming voice.The combination of small yet powerful motor， 115dB and 12V power input means that no other road user will be able to ignore you when you honk this horn! Specifications:Easy to install;Sound Level: 115dB;Number of different Sounds: 18;Powered by: vehicles' electricity - 12V;Power:45W;For use with ANY 12 Volt Vehicle(Car， Van，Truck， SUV， Motorcycle， Yacht， Boat， off Road Vehicle， Busses etc);Colour: Blue & White;Wiring:Red line connect with battery+Black line connect with the battery-Blue line connect with the button of the hornGreen line connect with the high frequency hornYellow line connect with the low frequency hornif there is no frequency indication， please repeat the above 4 and 5 step to find the best sound.Operation Guide:The electronic system control the horn to transform the soundPress the button continually for three time， the transformation of the sound is finished.Repeat the above step to transform the sound continually.One sound will be kept until you press the button.Package includes:2x Horn2x brackets and screws1x Controller