Not legal advice: The Canniks model 800 self defense stun gun claims to deliver 8,000,000 volts of stopping power to one's attacker.
It features a rechargeable battery, and small size that easily fits in either the hand or pocket. Additionally it offers a disable pin so that if the device is taken from you, the band around your wrist will remove the pin making the device unusable against you.
According to Digital Trends, stun guns are not only being used on the ground, but in the air as well. The Chaotic Unmanned Personal Intercept Drone, or CUPID, is a remote controlled helicopter armed with an 80,000 volt stun gun.