The Lutron RRST-RD-LG is a RadioRA 3 Sunnata RF Companion Touch Dimmer Switch in Lunar Gray, designed to extend multi-location dimming control within RadioRA 3 systems when paired with a primary RRST-PRO-N-xx dimmer. Supporting up to five points of control per primary dimmer, it features a capacitive touch light bar for smooth dimming, single-tap preset recall, double-tap full brightness, and a 30-second delayed fade-to-off; no neutral wire required at the companion. Companion devices do not count against RadioRA 3 device limits, preserving system capacity on larger installations. Coordinating wall plate sold separately.