In my Philips HX9332 Charging the ring was not there. The glass I do not want to use for charging. The electric toothbrush is too loose around it. Since it is just made of glass, it can be broken if dropped. In charging ring, however, the electric toothbrush is fixed and if dropped, this does not work well to break. Could also theoretically with traveling, since the power supply plus charging ring unlike PSU and glass is very easy.