The technology on stun devices is changing all the time. As of this date the two most powerful stun devices are:
1. the JOLT Stun Gun which is 20,000,000 V and available in pink, black, purple and green. It uses triple stun technology which allows electricity come from three separate points on the metal probes at the top of the stun gun making for a louder and more intimidating sound and a brighter electrical burst. It has a built-in charger with a slide out plug. So no batteries are needed. The built-in bright LED flashlight helps illuminate a target. The whole unit is covered in rubberized armor to help ensure a firm grip in any weather or climate. It also has a popular disable pin wrist strap.
2. The next most powerful is the 18,000,000 volt Monster Stun Gun. it has a lifetime warranty and comes with a rubberized armor coating for a no slip grip. Built-in slide out recharging plug save you money on batteries. This compact stun gun comes in black, pink, purple, white, black/white zebra, pink/black zebra and camouflage.
http://www.selfdefenseproductsinc.com has provided self-defense weapons such as pepper spray, stun guns, tasers, pepper mace, personal alarms and other self-defense items as well as surveillance cameras and systems for home or business security.