Cerberus Personal Safety (Persona) is an invaluable tool for enhancing personal safety and women safety in potentially dangerous situations such as hiking alone or walking home at night. It complements the native personal safety/emergency functionalities provided by Android by adding automatic alerts when you could be in danger. HOW DOES IT WORK? Specify some trusted contacts (friends or relatives), a place that you should reach and the time by which you should reach it. If you do not reach th