Interra KNX RF S-Mode Wireless 1 Channel Led Lamp Dimmer Actuator is used for dimmable LEDs, incandescent, and halogen lamps. It allows switching on, switching off, and dimming the lamps. It is a perfect solution for use in conventional installations without placing KNX bus cables with its bi-directional KNX RF communication functionality. It is also used to extend the distance between devices.