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This wireless wall switch is designed to control electrically operated or solar-powered roof windows. It has an open, stop, and close function, and can operate multiple windows from a single switch. The wall switch provides a convenient way to control the windows without the need for wiring, making installation quick and easy. It is compatible with a range of VELUX products, including roof windows, blinds, and shutters, and can be used to create a complete home automation system. With this wireless wall switch, you can easily adjust your roof windows to control natural light and ventilation in your home.