Battery Case for iPhone 4 2000mAh

Battery Case for iPhone 4 2000mAh,fashionable and convenient for take out. Specification: Product name:power pack Battery type:lithium-ion battery Product Compability: iphone 4G Standy time: up to 390 hours Talk time: up to 6.5 hours on 4.5 hours Internet use: up to 6.5 hours on 4G up to 8 hours on Wi-Fi Audeo play: up to 31 hous Video play: up to 9 hours Features: 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. It prioritizes consuption, pulling power from the power pack first, maximizing the iphoen's internal battery