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This concept comes from the research of behavior imitation.The rolling phone just take advantage of peoples behavior of rolling things with their fingers . Therefore , user can charge the cell phone at the same time.
Jiawei Zhang,Chengyuan wei, Guanyun wang, Fan Zhang, Yan Shi,Cheng Zheng, Yu Zhang,Huabiao Shan,Leijing Zhou Pengxiang Jia,Duyin Qin,Qi Wang