BXT Brand New Iphone 4 & 4s 2200 Mah External Battery Charger Case for Iphone 4 with Iphone 4s Cases - (Pink) Advance 2200mAh battery charger case for iPhone 4 & 4S Made up of high quality li-on battery Elegant and fashional appearance can bring you to the top of the fashion tidal Standby Time: Up to 210hrs; Audio Playback: Up to 28hrs; Talk Time: Up to 8hrs. Many colors to choose:White, Black, Rose, Blue, Pink, etc.