Powerful horn with compressor. If your car is not noticed on the road? Or pedestrians jump out on the roadway, and impudent autocrats cut in line without even showing turn signals? Then give them a good whistle! A compressor with a pressure of 120PSI and four chrome plated horns produce a powerful sound of 150 dB, which will be heard by everyone in the neighborhood. The unit is powered by 12V. All the necessary tubes, washers and fasteners for installation are included