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There are lots amounts of people using smart phone, everyone might come into the situation that running out of batteries and in the need of finding outlet or carrying the charger. Use the material that can absorb the light energy to make cell phone shell, It makes cell phone has the protection of the shell, and we can charge our phone anytime anywhere.
When there is light, it is chargeable, there is no need to expose under the sun.
.It can still insert the transmission line to transmit and charge while having the large amount of power consumption. It solve the problem that cell phone needs to be charged all the time.