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Safe Yo-yo / Yo-yo

Safe Yo-yo

Yo-yo is a very popular toy. Playing yo-yo can store
energy easily. Safe Yo-yo can be easy to hang on bags.
When children enter the dark environment during their way back, Safe Yo-yo, controlled by the light sensor, will put out bright red lighting to remind passing vehicles and pedestrian.


Hunan University

Hunan University
Changsha, China


Hunan University

Hunan University
Changsha, China

Yue Zou Ran Duan Zhilong Luan