An electrical appliance device contains a knob which has a knob front assembly with a front cover assembly, a knob bracket, and a display module assembly disposed between the front cover assembly and the knob bracket, and a knob rear assembly including a circuit board and a hollow rotary encoder. The rotary encoder is mounted on the circuit board. The electrical appliance device further has a panel with an opening. The knob front assembly at least partially passes through the opening such as to be mounted to the knob rear assembly.