Very loud. I bought these in place of air horns. Easy to connect. Just a cable to the battery and the remote control works great. I drive a Toyota Sequoia but didn't install it because I could just put it under the hood in the corner. You will need additional splicing wire as the wires are only about 15-18 inches long. The kit does not include any mounting hardware or instructions, just connect red to positive and black to negative.
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