PolarPro PowerPack Extended Battery Module for OtterBox Universe Case Fits OtterBox uniVERSE Case for iPhone6/7 and iPhone 6/7 Plus Provides up to 100% charge (iP6/7) and up to 70% charge (iP6/7 Plus) Slim design fits comfortably in your hand Removable design allows you to use it when you need it, and store it when you don't Made for iPhone certified-guaranteed compatibility