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It's hard to get the power without any electronic system.
In this case, 3s band can be a generator and fashion item at same time.
This band generates electrical power from body heat and simultaneously that makes body temperature get lower.
Also, this band can charges the electrical power so you can use it whenever you need the energy.
And then, this band has a variety of patterns for people who want to catch up the trend.
Gyeonggi-do, South Korea