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.

 

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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