Portable power pack dual usb charger battery capacity 6 000 mah interfaces lightning microusb power output max 24 dimensions 8 5 x 5 5 x 2 8 mm weight 160 g features battery indicator included in delivery user manual micro usb cable rechargeable battery technology li ion output voltage 5 v operating voltage 5 v special feature integrated charging cable compatible smartphones apple iphone 4 apple iphone 3gs apple iphone 5s apple iphone 3g apple iphone