back-up power case for iphone4/4s 1:capacity:1900mah 2:iphone4 external battery backup power pack 3:popular in europe Back-up Battery case iphone ... charge 7) Comfortable handfeel 8) USB Port 9)eight colours for optional: Black, White, Cyan, Magenta, Yellow, Red, Purple,Orange.Specification ... :152 x 87 x 23mmGift box weight: 180g new arrival back-up power case for iphone4/4s