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- ...to Carry】Handy compact cell phone solar charger, folded size like a smart phone. You can put it in backpack or even your pocket while charging your phone. Simply hang it on your backpack using the carabiner (included). Stay a hands-free while on the go.Yet its recommended to take the solar charging feature as the emergency back-up solution instead of main power sources. It's difficult to produce intensive power via sunlight due to sunlight intensity and panel conversion rate..