Batterytec&reg; Portable Battery charger for Apple iPhone iPad Samsung Galaxy Android Phone Smartphone Tablets 8800mAh (DC 5V, 1A USB Output) Universal Compatibility: it is compatible with most mainstream mobile phones and tablets. Super Slim and Exquisite Design: The slim features plus a glossy finish ensure a more comfortable grip. Portable, mobile, Super Slim, light wight and compact designs make it more convenient to carry in your pockets or purses. With 4 LEDs to indicate charge levels, enter power saving mode after 3 minutes. Swift Charging while Discharging: Special design enables to charge the device while being charged, it saves your time. For better performance, please pair using your original USB cable to charge the device. For charging the battery, please connect the micro usb cable with battery to PC or DC 5V USB charger. DC USB charger is not included. High Capacity: Premium Grade A Battery Cells used to assure high quality and reliability. 8000mAh, 500+ recharge cycles over the life of the battery. Provides 2~3 charges for iPhone 4S. It will never let your phones run out of Juice when you outside.