2 usb ports enable you to charge two devices simultaneously thanks to 21a charging power it can charge energy hungry devices like tablets mobiles and sat navs you are even able to charge an iphone more than 6 times for example due to 15 000 mah compact lithium compact rechargeable battery 2 usb ports for simultaneous charging charging current 1a 21a led display for battery capacity and charging status usb charger cable usb a to micro usb supplied integrated led torch s