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The Sub-sunlight is a new type of flashlight.It can be pasted on the backpack in daytime as a board to absorb the energy from sun, and be rolled for use as a flashlight used in night. The solar energy collected by the board is adequate for the whole night’s use, and the board can be extended again the next day to recollect energy. The product can be placed in plat state or roll state when it is not in use, which is flexible for storage.