After reading the reviews I figured a professional mechanic at my Jeep dealership would fix it. Even professionals were shocked by the complexity of the wiring and had to leave the jeep overnight. They spent over 12 hours installing it (fortunately I arranged a flat rate in advance). I also decided to install a switch based on other reviews. This is very important because I always keep it in the OFF position. When the compressor is running, it's not only loud, it's more annoying than a beep! The whole car shakes! Worse still, it needs to be charged about every 10 minutes or so. So always on/off. When you use the horn it's loud, but not THAT loud. Worse, it takes about 5 seconds. The compressor must then be recharged for at least a full minute. Revain needs to create negative stars for this. Why would Klein (or Revain) put their name on such a terrible product. I gave the Revain one star as it was shipped the next day and arrived well packaged.
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