You have a good opportunity to scare his friend just took the phone sharply from behind and holding the button Shock. Believe me, it will be a long time you remember it. Also, you can try to divert shock guns of bandits that application if attacked you in the alley. Perhaps then you will save your life, though at the cost of the phone. Attention, the app is a joke and will not generate an electric voltage, as in the present shock weapons.
9Apps 4.9
