Qzoxx 1900 mAh Portable Red Ultra Slim External Backup Charger Battery Case For Apple iPhone 4 4G & 4S Compatible Device: Apple iPhone 4S /4 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 Package Include: 1x External Backup Battery Case, Color : White