This charger is a charging station, where the battery is charged by induction. I tested it properly with my Nexus 5. Works. When the smartphone is placed on the station, it is detected and charging starts. An integrated function detects when the battery has reached 100% charge level. Once that event has occurred, the charger turns off. In this way, overcharging is prevented. Charging will resume when the battery level decreases. Thus, the energy reserve is virtually always maintained at 100%. Ideal device for your desk is. One has the possibility to be device store anytime on the charging station without having to insert repeatedly charging cable into the socket. The coating of the surface is chosen so that the phone does not tend to slip. This may also depend on the quality of the smartphone. Overall I give the device five stars because it is in my opinion is a very good value for money. Similar devices from other manufacturers are much more expensive and can also no longer in effect.