E-Trends Dual USB Port 5000mAh Solar Cell Phone Portable External Backup Power Bank Charger for IOS Devices, Android Devices and Other Electronic Devices (Yellow) Grade A 5000mAh Lithium Polymer battery with dual 2.1A output ports Rainproof, shockproof and dustproof Solar energy technology, environmental friendly and could recharge itself under sunshine for emergency purpose when outside; Solstar can charger your iphone about 50% to 60% juice for emergency after being solar charged for 7 to 8hrs under normal sunlight, It's not easy for 1.2W input Solar panel to fully charge the buit-in battery with sunlight, thus, we suggest it for casual use,For long trip and hiking etc. Charge up from a wall socket OR go green and use solar energy Compact, portable & stylish design; Easily fits into your bag to provide instant power; Football grain design has anti-skid protecting effect