The electric radio-controlled surface-mounted belt roller. The RolloTron Swivel Roller Standard DuoFern is an electric surface-mounted belt roller. With it, you can control your roller shutters via radio. It is ideal for tight spaces and is characterized by quick and easy installation. The operation is via a Euro plug connection to the 230V power supply. This electric roller shutter belt roller can not only be remote-controlled with the DuoFern transmitters but is also compatible with the HomePilot, the DuoFern central control unit, or the RolloTron Comfort DuoFern. This gives the radio-controlled belt roller numerous automation functions such as daily, weekly, and astro programs, as well as a random function. You can also freely choose the ventilation and sun position, and with the press of a button, you can easily switch between automatic and manual operation.