Hidden Automotive Horn Prank - Loud horn activates when brakes are pressed - 4 pin + 7 pin trailer plug connection

This was a hilarious prank only downfall was he found it too fast

But it is tied into the lights or blinkers. Not break alone. If they use a key fob and the lights blink when unlocking this sets off the horn

Great prank to pull. Good quality product. The horn is a little quieter than a normal vehicle horn but certainly has the desired effect. I even I had one of my coworkers try to burn it up by holding the brake for 5 minutes and it held up fine.

I love the ease of set up, II put it on my son's truck and he could not hear it. I drove behind him to see his reaction . I couldn't hear anything. Maybe people outside on a sidewalk can hear it but I feel like that may cause issues all of it own. Great idea, I'll try to tinker around to make it louder.

Was loud enough to startle my grumpy uncle

Great buy, easy to install!