The control devices with radio technology in the RF BF 74 series from Steute have a fully modular design. Switch inserts and different colored types of pushbutton caps with labeling can be combined with various types of pushbuttons, key-operated switches and toggle switches. For the housings, users can choose between versions for one, two or three switches. If more than three operating elements are required, larger enclosures are also available. Neither a power cable nor a signal cable or even a battery are required. The switching signal of the control devices is transmitted via "sWave" technology at 868 or 915 MHz. According to the manufacturer, this ensures high transmission reliability and enables ranges of up to 60 m in buildings and up to 700 m in open areas. An energy generator generates the energy: It converts the kinetic energy released when the switch plunger is actuated into electrical energy.