38800mAh High CapacityBuilt-in 38800mAh premium Li-polymer battery with a compact solar panel. Solar charger can charge your devices multiply times. Great for camping, cycling, hiking, ideal for outdoor activity. Fast & Smart ChargingEquipped with dual 5V/2.4A USB outputs, fast charging TWO devices simultaneously. Up to date technique provides intelligent security protection, compatible with your iPhone, Samsung, HTC, Nexus, Go-pro Camera, Tablets, and other USB devices. More than 1000+ recharge lifecycle.