Highlights: This battery can be charged either by the solar panel on the back or via USB (Universal Serial Bus) port/AC adapter Wallet design to store your business cards or debit/credit cards for easy storage Compatible with iPhone 3G/3GSSpecification: Dimensions: 13 x 7.2 x 2 cm Weight: 101.7g Panel Type: Multi-crystal silicon Solar Energy Conversion: 16% Built-in Li-ion Battery: 3.7V 1500m Ah Output Voltage: 5 V Output Current