Ranging from pistol shaped items to black boxes with metal pins sticking out, despite their name, Stun Guns are not guns (see Taser for the ranged version). Stun Guns use electricity to incapacitate living targets by short-circuiting their nervous system. The attack has to strike against bare flesh as any type of armor (even supernatural) stops the Stun Gun from harming the target.
Once struck by the electric attack the target must make a Vigor Test against the Wind Damage dealt. Failing this roll leaves the target stunned for a number of rounds equal to the number they failed the test by, or until they make a Incredible (11) Vigor test on their action.
Stun Guns use 1 charge out of their battery per attack, and take a small battery.