The Lutron RadioRA 2 RD-RS-BL is a 120 Volt smart remote light switch, companion switches are for multi-location installations. The RadioRA 2 Maestro local controls function much like standard dimmers and switches, but can be controlled as part of a lighting control system. Local lighting controls are useful in locations where single circuits of lighting need to be dimmed or switched. Local fan speed controls are useful in locations where control of a single ceiling paddle fan is needed.