You set this device up by putting a plastic cap on the brass stud, then pulling the detonator back, closing the lid and then putting it under something to weigh it down like a bag, book, glass, can, shoe etc.
When someone removes the object you placed on top of the detonator it fires the cap which makes a loud bang scaring the living daylights out of your victim! The device uses plastic caps (not supplied) to produce the bang. The person who sets it off won't know what has happened until you tell them that they've been had!
Great joke to use under any object that is heavy enough to weigh it down and these make great gifts. The device is 3cm long by 1.4cm wide by 0.5cm high so its easy to hide it under objects.
To offer this product at the lowest price possible it doesn't come with any packaging, except for the jiffy envelope that we send it in.
We also sell the caps to use with this product.