The world’s smallest stun gun is the streetwise mini Stun gun. At a little larger than three inches long, two inches wide and three quarters inches in diameter, this little guy packs a wallop with its one million volts.

It uses three, 3-volt lithium batteries but it can also be upgraded to a rechargeable unit for a few dollars more. This will save you the typical fourteen dollars it costs to replace the batteries. This mini stun gun is smaller than a pack of cigarettes.

Not only does the voltage amount mean faster immobilization, it means that the current can pass through layers of clothing.