Security Plus® Electronic Stun Devices set the industry standard for quality. While other brands use cheaper materials, we pride ourselves on the highest quality possible. Our Stun Devices are priced very competitively, and when compared to other brands, you'll notice a distinct advantage in performance and reliability. This trait is unique to Security Plus® Stun Devices. When you buy a Security Plus® Stun Device, your satisfaction is 100% guaranteed! Stop and drop any attacker, no matter how big. A whopping 500,000 volts of bone-jarring electricity will literally knocks assailants to the ground. You'll get maximum protection that is guaranteed safe. This high-powered Security Plus® device works on just two 9 volt batteries and comes with a lifetime guarantee. You'll always feel totally safe when you carry this Security Plus stun device with you.