Volume can not be controlled

The product has to be very good properties. One point deduction but there is that the volume of the device is not self-sufficient regulated. This leads possibly to the fact that the sound transmission into your ear even too loud. With our Gigaset phone itself the quietest volume leads (regulated on the phone) close to extending tinnitus. Thus, it can depend on the used phone cause the product is not usable despite its good basic characteristics.