The Double Trouble Stun Knuckles are like having two stun guns in one. Twice the contact, twice the stopping power 1.2 million volts to be exact. More effective than most stun guns because of the space between contacts. The greater the space, the grerater the effect. Most stun guns only have 1.5 inches between contacts, the double trouble has 5 inches between contacts. The soft contoured grip makes them easy to hold and hang on to. The safety switch is on the top with a red on/off led indicator to let you know when it is ready to fire. Uses two CR123A batteries (included). Also comes with a hand strap and a free nylon carrying case with belt clip ($15.00 value). Only 6 inches long. Weighs 6.9oz.