The Lutron RRST-RS-BW is a RadioRA 3 Sunnata RF Companion Switch in Brilliant White, used to expand multi-location on/off switching control within RadioRA 3 systems when paired with a primary RRST-8ANS-xx neutral switch. Up to four companion switches can be paired with one primary unit, creating five-point switching control for lighting or motor loads with tap-on/tap-off operation and 30-second delayed-off capability. No neutral wire required at the companion device, and companion switches do not count toward RadioRA 3 device limits. Coordinating wall plate sold separately.