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In some undeveloped country, they are lack of water.
It takes them a long way to take the water everyday.
From the knee protection,it can reduce the burden to the foot.
Also another additional electronic storage function,so that they can use the extra power.
With the knee bend action, it makes the device in the kneepad can switch the energy from kinetic to electric, then the LED shine.
Lai, Hung Yu,
Liang, Ya Zhen,
Ya Wen Hsiao,