Radio systems allow the control of electrical installations can be controlled without fixed lines. Lights or shutters in buildings can thus be conveniently operated from the near vicinity. Radio systems have the advantage that they can be used anywhere where existing installations cannot be expanded to install fixed control systems. In addition, individual receivers can be controlled by means of an indefinite number of transmitters. Remote control devices or wall switches that transmit radio switching signals can be used to control bulb sockets, for instance. The systems also allow control by means of smartphone or tablet. Radio systems uses a radio frequency of 868 MHz, allowing them to function virtually without interference.