Maestro Wireless RF Plug-In Dimmers function like standard dimmers and have an integral microprocessor, allowing them to be incorporated into Maestro Wireless solutions. Communication with the system is accomplished via radio frequency (RF). Plug-in Dimmers are useful in locations where plug-in lamps need to be dimmed/switched. RF Lamp Dimmers incorporate advanced features such as fade on / fade off, slow fade off, and rapid full on.