Efo is at it again with another iPhone 4 accessory, this time it serves dual purposes actually to charge the iPhone 4 and it has a USB port to charge anything else that might need the extra juice.

The sleek power pack snaps inconspicuously onto the back of your iPhone, adding only a few millimeters of thickness, but more than doubling the battery runtime. If prioritizes consumption, pulling power from the Power Pack first, maximizing the iPhone’s internal battery.

 

       

 

• Product Link : http://efo.buy-lowest.com/mobile-c-88/iphone-4-4g-power-pack-with-usb-output-p-283

• Video Demonstration : http://www.youtube.com/watch?v=hGkBeObhaGE

• Price : US$30

Specification

• Battery type : Lithium-ion battery

• Weight : 74g

• Product compatibility : iPhone 4/4G

• Standby time : upto 390 hours

• Talk time : upto 6.5 hours

• Internet use : upto 6.5 hours on 4G and upto 8 hours on Wi-Fi

• Audio play : upto 31 hours

• Video play : upto 9 hours