The Fibaro Universal Dimmer 2 enables the retrofitting of a standard electrical installation to a Z-Wave-based system for switching and dimming. The device is placed in a wall box directly behind the switch. The switch is no longer operated locally by the consumer, but delivers a control signal to the Fibaro device, which in turn is remotely controlled by the consumer. However, control can still be carried out via the existing switch. The module works with any switch series and any design, as long as there is enough space in the installation box.