How much voltage is necessary for a stun gun to be effective? Every now and then, I come back to checking out those "Small Fry" stun guns, which run off of three CR123s. They've got several models, including a 400,000, a 700,000, and a 1,000,000 volt model. They all run off of 3 CR123s. Would any of these really be more effective than the others, or would the 400,000 volt model do just as good of a job as the 1,000,000 volt model?
What other things, besides voltage, are factors in the effectiveness of a stun gun?