To operate digitalSTROM, push-buttons are necessary beause they - unlike switches - swing back after being pressed. This allows multiple clicks to help you operate your smart home. Furthermore, digitalSTROM has a dimming function. By pressing the push-buttons for a some time the lights are dimmed. With a switch this would be impossible since the pulse duration can not be determined. For example, you can assign up to four different lighting scenes to a single push-button.