This Train Horn Gun Kit includes a remote control and trigger button. Also can be used for other brands of brushless drills.  Just do it with our Drill Train Horn Kit with 4 Trumpets! Premium Trumpets Upgrade Available What's inside? Air horns assembly Air compressor Pre-built harness with remote signal receiver (not pictured) Remote Control Air pipe 2 screws We included all the necessities for building an extremely loud cordless horn from your impact tool. Most brand tools perfectly fit our compressor and horns to build it yourself. Otherwise, you will need to grind the shell. How to make an impact train horn? Here are simple steps: Unscrew a clamp shell Remove gears Remove drill motor Remove harness Fit shell to match air compressor Install new harness Connect air compressor to terminals Connect the battery and doublecheck compressor works properly Screw back shell Drill 2 holes for bolts from the back side Install horns mount using 2 bolts Connect a hose to the compressor and horns Enjoy your new horn!