Horn installed easily, sounded good. Then I really had to use it. The first few times no problem. The weather started to get colder and suddenly the sound started changing to a low screeching. I tried a few more times with no traffic and that was it! Died. .I could still hear the compressor struggling to make a sound and then it gave up! I consider the horn to be one of the most important parts of a car's safety system. I have nothing now. I kept the original horns so I think they will come back.