Review on XMSound Compact Snail Car Horn: Ultra-Thin Waterproof Loud 12V Auto Kit for Trucks, Cars, Motorcycles and More! by Russell Wong

I mounted them on my skid steer loader as the original only made a pathetic hum due to age and vibration. They will definitely wake you up! As a sensor they are far superior to the original horns on my k 2500. Negatives in my case were that although they were in a sealed envelope the box was damaged and I had no nuts or wires just horns. I didn't care because I was going to mount them differently anyway. Notice the seller, you're lucky, I don't care, so 5 stars anyway.