This is a 2 trumpet train horn kit for car, truck, UTV, off-road vehicle or even build your own DIY Impact Train Horn. Comes with 12 volt mini air compressor, tubing and 2 trumpet train horn. These are extremely loud 140-150 db. They can also be used for a impact drill train horn setup. Picture is shown of a completed impact drill train horn. This is for reference only and does not come with the set. You will only receive the horn, compressor, tubing as mentioned above. I use this exact kit to build Dewalt, Ryobi, Milwaukee and many other horns. Very good product, very reliable. Sold over 1000 of these last year alone.