Power tube portable power pack battery capacity 2 200 mah interfaces microusb usb power output max 1 dimensions 91 x 20 5 x 20 5 mm weight 66 g features battery indicator included in delivery micro usb cable usb cable colour blue rechargeable battery technology li ion input voltage 5 v output voltage 5 v operating voltage 3 7 v material plastic input power 1 applications smartphone camera mp3 player