TCD Blue 1900 mAh Quick Charging Rechargeable Power Bank External Battery Case Cover for Apple iPhone 4 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 Battery type: Lithium-ion battery Capacity: 1900mAh Input: 5V 1A Output: 5V 500mA Standby time: Up to 230 hours Talk time: Up to 6 hours Internet use: Up to 5.5 hours; Up to 8 hours on Wi-Fi Audio play: Up to 30 hours Video play: Up to 8 hours Color