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Elf of Outdoor first-aid：Increase in outdoor activities led to an increase in risk factors，and it's too difficult to treat a wound when you hurt badly，and medicine box is inconvenient to carry!Now,this wrist strap is emerge as the times require!Colorful，diversified style and convenient to use！It’s reusable and has simple structure，quite suitable for people who love outdoor activities.
Wan Duo Yang
Wan Duo Yang,
Xian university of science and technology