Poweradd Pilot E 5000mAh Dual-Port Portable Charger - White 100% real capacity of 5000mAh, provide 200% battery life for all iphones,or 100%-150% battery life for a samsung galaxy S3. Lithium battery cells:Built-in high quality cells with lightweight, portable and reliable. More than 500 charge cycles during the course of its life. Dual USB output: Output 5V/1A and 5V/2.1A,charging your two devices simultaneously provide you more convenient in emergency situation Smart LED indicator:Four smart LED indicator display clearly how much source you've got left ,easy to use.Portable design charging your device any time and any where. Package contents: Poweradd&trade; Pilot E external battery, USB cable, connecting tips, user manual.