The DIY kit comes with just about everything you need. Horns, compressor, wiring and all mounting hardware. You may need other supplies. You can use this kit for almost any impact driver and some drivers. (Will not work on Milwaukee M12 or Makita)

If you bought any train horn you can swap out those horns to make yours a single train horn. 

By swapping out your existing horns, this single train horn will provide you with the powerful sound you're looking for.

This horn is compatible with various vehicles, including cars, SUVs, motorcycles, yachts, boats, off-road vehicles, and buses.

Please note that this product does not accept refunds.