You hide this device under a toilet seat and when someone lifts the toilet seat up a loud bang is produced! It's small enough so that you can easily hide the device so nobody will be aware what is going to happen before its too late! The device works by firing a cap when the toliet seat is lifted like a cap gun does when you press its trigger. The plastic caps required are not included. They come with instructions on the back of the packaging.
We also sell the caps to use with this product.