1900 mAh Portable Pink Ultra Slim External Backup Charger Battery Case For Apple iPhone 4 4G & 4S + Free HSINI Stylus Pen battery charger case; iPhone High-capacity,1900mAh rechargeable lithium-ion battery/ Output 5V/500mAh Fully charged in 3-4 hours, 4 Led lights indicates the power level Light-weight, super-slim design to carry with your iPhone as well in style