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Concept :The power of the Solar Energy transformation is not high so far. Therefore, the area of solar panel on products in this industry nowadays is still trying to be broader .
A flexible roll-up spring ruler can expand to a flat, and enroll into a small cylinder with one finger conveniently. We can use it intuitively like to take an electric torch and use it with efficient power transformation in dangerous situations .
the main surface absorbs the solar-energy, also can be rolled up easily and make it smaller.