@user5970673954480: This is probably the most annoying sound I've ever heard. What the heck is that? Oh, this? You can put this on your **car** or **truck**. It runs off an **air compressor** and it's a **dual-tone signal**. Check that one out! But, if you're looking for something a little less annoying, they offer a **quad-tone**. There are also other tones available. You can find them in the link below. Check them out if you're interested.