The DuoFern hand central unit is designed to control up to 45 DuoFern devices in up to 9 individually configurable groups. It features a backlit LCD display with an intuitive graphical menu and a practical motion sensor for display activation. Additionally, the contrast of the display can be individually adjusted. It offers many practical functions for automating device groups, such as daily, weekly, and weekend programs, an astro function, or a random function. Furthermore, in combination with the DuoFern environmental sensor, devices can be automated based on weather data. Individual names can be assigned, and sorting for devices and groups can be established. DuoFern devices can also be configured and automated easily and comfortably. It supports the configuration of ventilation positions, endpoint settings, direction reversal, intermediate positions, and runtime. In addition to automatic DuoFern device search, registration via radio code is also possible. The summer and winter time change can be activated or deactivated. For backup, restoration, and firmware updates via PC tool, it is equipped with a USB interface.