Features:

*Perfect solution to charge your 3G or 3GS  iphone4  when out and about with this portable power station.
*High capacilty Li-ion battery.
*you are from the worry of power shortage on your iPhone.
*Unique design, very simple and convenient to carry and use on your iPhone.
*you can still use all of the iPhone's functions with it while it's powering your device!

*Weight: 66.5g
*Real Capacity: 1700mAh-3700MAh Li-ion built in cell battery
*Cell type:Li  battery Lithium-ion
*Dimension:113×66×21(mm)
*Output voltage:5V
*Output current:1A max
*Cycle life: 500times
*Automatic test functions built into the jacket to ensure the Li-ion battery charges to full capacity (with LED indicator)
*Data transmission capable, this means the iPhone can connect with your computer while in the jacket!