STUN MASTER MULTI-FUNCTION rechargeable stun gun features 4.5 million volts, a super bright LED flashlight, red flashing emergency lights, alarm and disable pin wrist strap. 4.75 x 2.5 x 1". Free Nylon Holster included.
 

You need to touch an attacker with a stun gun for it to be effective.  The best places are neck, shoulder, abdomen and groin.
 

A half second application can cause some pain. A one or two second dose will cause muscle spasms and confusion.
 

A 3 to 5 second application will cause the loss of balance and muscle control, confusion and disorientation.
 

Stun guns will go through a 1/2 inch of clothing.
 

There is no shock back to you even if the attacker is touching you.