The Stun Master stun gun does not rely on pain for results. The energy stored in the gun is dumped into the attacker's muscles causing them to do a great deal of work rapidly. This rapid work cycle instantly depletes the attacker's blood sugar by converting it to lactic acid. In short, he is unable to produce energy for his muscles, and his body is unable to function properly. The stun gun also interrupts the tiny neurological impulses that control and direct voluntary muscle movement. When the attacker's neuromuscular system is overwhelmed and controlled by the stun gun he loses his balance. Should the attacker be touching you, the current will NOT pass to your body! Stun Master has been a leading brand in the stun gun industry since 1994 making it a true icon in the world of self-defense. This type of success for so many years in a competitive field is the finest recommendation any product could be given. Features: - 100,000 Volts - 4.5"" Tall - Safety Switch - Wrist Strap - Lifetime Warranty - Uses One 9V Energizer Eveready Alkaline Battery (not included)