The Hottie 5,000,000 is our most powerful stun gun. Its rubberized coating protects the unit and provides a firm grip. To help this stun gun maintain its maximum power we use superior nickel-metal hydride rechargeable batteries which hold a full charge longer then nickel-cadmium batteries that are used in most stun guns. With the built-in recharging plugs there are no cords to keep up with. You simply plug it into a standard wall outlet.