Incipio SA-094 OffGRID for Samsung Galaxy S4 3100 mAh - Retail Packaging -Black - Easy to install - Slim profile does not add bulk to your Galaxy S4 - Charge and sync while the case is on the phone - 4 LED indicator lights lets you know the status of your battery Up to 3100 mAh of power for up to 15 hours of additional talk time, web surfing, downloading, or streaming