Provided that the AC adapter (not supplied) or strong (the charger 5V 2A demand input), the burden is really fast. By cons, if you use too little power AC adapter (for example less than 1A), charging will not occur at all. The disc surface is very important (once laid over your smartphone will be much stable) and it is very late. By cons it is not easy to find the right position for the load, as the directions of the LEDs are not clear (if the phone is slightly out of position, the green / blue LED will flash as when it load then stop ). With a little practice, when one knows where to position the phone, this annoyance disappears.
