Panic (ro.man.panicbutton) on Google Play
If you need help press the panic button. They will call you. If you do not answer they will come for you. With one press on the icon of the app, a message is sent to each of the three people who most want. Before you have to choose either the three people that you trust best. With only enter once their phones, Panic will set and advise them just to touch it every time you use it. The message says who you are, and asks to be called URGENT. Also send them a map with your position if you do not answer they will get you.