If I were picking out a stun gun, I would probably look for the most adorbs one. So I thought I should go on our site and see which one I would pick out for myself, and quickly got lost in the volts and amperage. What is important, and is there too much of a good thing? Turns out, electricity is a fascinating thing.
First off, brand is important, but since Safety Girl only carries well-known quality brands like Uzi and Ruger, you can ignore this component if you buy 
from us. Some use replaceable batteries, and some use rechargeables. Depending on how much you use your stun gun, you may want a rechargeable one.
The power of a stun gun is specced in amperage and voltage. The voltage carries the amperage, which is what stuns the attacker. It is these two things working together that explain why a shock from your doorknob at 30,000 volts won’t hurt, but plugging a fork into your electrical socket (120/240 volts), will pack a dangerous whallop – it’s the amps! Amperage describes the rate/strength of the charge and voltage describes how far the current will jump. The stun gun should have between 2.5 and 4 milliamps, to be effective , yet not kill the attacker or melt the circuitry.
Don’t forget to look for some type of safety, be it a switch or a trigger.
Safety Girl Blog 