Dual usb charger portable power pack battery capacity 6 600 mah interfaces microusb usb interace output 2x usb type a power output max 21 dimensions 84 x 64 x 21 mm weight 160 g features battery indicator included in delivery usb cable colours grey white rechargeable battery technology li ion output voltage 5 v operating voltage 5 v material plastic charging cycle ca 500 charging function charges 2 devices simultaneously applications smartph