Power tube dual usb charger battery capacity 10 400 mah interfaces microusb usb interace output 2x usb type a power output max 21 dimensions 50 x 50 x 85 5 mm weight 200 g features battery indicator included in delivery micro usb cable colours red blue rechargeable battery technology li ion output voltage 5 v operating voltage 5 v charging cycle ca 500 charging function charges 2 devices simultaneously applications smartphone camera mp3 playe