In the holder can be simply put his cell phone and has it so in view. The gap is thick enough that even a cell phone with envelope reinpasst (In photo with a S5 Cover by Spigen).
The charging function is switched on via a large push-button switch, the function is indicated by a blue LED. The charging ports I've tested with an ammeter. My S5 is loaded with about 1.5 A, what is "good". The original power adapter recharges with about 1.8A, the cradle of Ugreen is therefore a little bit slower.
All in all, I have nothing to complain about. The price I think it's good and when loading you have your mobile phone in view at the same time and can watch movies, a lot of space takes the box and not going away.