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Walking alone outside at night are still not safe in many areas, because criminal offenders often assault those pedestrians in the darkness with fluke mind that no one would detect them on account of the lack of monitors and few people nearby, which also causes great obstacles for the police to collect effective evidence. Aiming to break this phenomenon, the guard drone, controlled by the local police station, can threaten potential offenders by alarming sounds and protect pedestrians by Real-time GPS Location, Panoramic Camera and One-button Call.