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Brooch is divided into front and rear these two parts, the front is for decorations within the built-in alarm system. And the rear part has divided into the pins that put on clothes and a built-in GPS positioning system. The front and rear part of brooch are connected by magnet which is easier to make the front part drops during the process of victims struggling ornaments.
The alarm system will startonce the decoration separated from the pin, and then the police will receive the signal based on GPS positioning system to track victims to carry.