How discreet is this mini stun gun??? It is about half the size of many of the stun guns on the market and light enough to be carried on a key chain. With 20,000,000 volts, this super small stunner will definitely pack a punch. It is similar in size to a small pack of gum (measures a mere 3.25 in. x .75 in. x .50 in.) making it the smallest keychain stun gun in the world! This model features a unique slide switch which makes it easy to use in the event of an attack.