Practically but slips out of his hands.

The charging shell looks good and makes the phone barely bigger. You can attach and remove again without great power easily. For me this is particularly important because I often times the camera used Grip. The shop works on original charger of Nokia both also at other manufacturers.
Unfortunately, the charging shell is very smooth and you have to watch so that the smartphone does not slip out of his hands. The manufacturer should come up with something.

Greetings from Berlin

Franz Maier