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The Traffic lights / Audio / Video

The Traffic lights

Which stick up the surface of battery can change colors based on electromagnetic wave of battery.It have many kinds of electromagnetic wave along with the time battery used it can from red to green to remind people of the battery in time.

University

Shandong University of Science and Technology

Shandong University of Science and Technology
Qingdao, China

Shulin Yu,
Shandong University of Science and Technology