Installed on my 2004 Benz ML350. The relay that came with it didn't fit in the fuse box so I didn't use it. The horns were relatively easy to install on my car - about 20 minutes. The horns are loud but not obnoxious and worked great for what I needed. If you are expecting a very loud beep, this is not the product to buy. I would go with an air horn.
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