Portable power pack battery capacity 4 200 mah interfaces usb power output max 21 dimensions 118 x 67 x 8 mm weight 105 g features battery indicator compatible smartphones htc one apple iphone 5s google nexus 4 apple iphone 6 lg g3 nokia lumia 1020 apple iphone 4s applications smartphone camera mp3 player securities overcharge protection discharge protection short circuit protection surge protection