Electric training stick
It was featured in many Kink.com films a few years back. The toy has a simple design consisting of a black handle with a push-button that sends an electrical current up a red wand to the tip, where two metal prongs are exposed. When the button is pressed and the prongs touch skin, they release an electrical discharge. This is a fantastic fear toy. It makes a loud bang noise, emits a bright spark, and gives a small electric shock - similar to a static shock. It’s extremely simple to use - just hold the button, make contact with the skin, and it will instantly spark and give a static shock. All it needs is two AA batteries (not included).The pain, surprisingly, is only moderate–sometimes even mild. The real terror comes from the sight and sound of the electric discharge, rather than the pain it causes. This is a fantastic intimidation tool in a scene.