Portable power pack battery capacity 5 000 mah interfaces usb microusb power output max 21 dimensions 125 x 69 x 9 9 mm weight 156 g features onoff switch battery indicator included in delivery usb cable user manual colour silver rechargeable battery technology li ion output voltage 51 v operating voltage 5 v material aluminium applications smartphone camera mp3 player securities overcharge protection discharge protection short circuit protec