You were given a device that can alter the brain of whomever it is pointed at. It is also discreet so nobody will know you have something to do with it. You just need to point the device at someone and you can alter their personality, memories, tastes, likes and dislikes, as well as control their actions. You do this either by speaking with the affected target or by writing commands in the devices screen. The device can control an unlimited amount of people at the time and you can control them individually or in groups.