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" Spy's Tracer " is a tracking device. When spy wears this bracelet, it will look like a common wristband. If spy needs to catch criminal, he can expand the bracelet and hit criminal’s wrist, the wristband will roll up and lock criminal’s wrist. Criminal can’t remove it by himself because the bracelet has magnetic lock design. When criminal escapes and wears the bracelet, criminal will be tracked by spy. Spy can catch criminal easily.
National Taipei University
Taipei City, Taiwan
Chen Szu Yu,
National Taipei University of Technology