1Works with 2pcs 606090 or 706090 polymer batteries, 8000mAh or 10000mAh large capacity is easy to obtain, you can easily charge for your phone anytime and anywhere. 2Supports solar fast charge, safe and environmental friendly, suitable for sport, travel, and other outdoor activities. 3Provides dual USB ports, you can easily charge for two devices at the same time, or share this backup power with your families or friends. 4IP6 waterproof protection and printed circuit board assembly, fully protect your devices from water, overload, overcharge, overheat and short-circuit while charging. 5Environmental friendly and power saving, automatically enter sleep mode and lock the power while not in use.