Occupancy/vacancy sensor switches use advanced Passive Infrared (PIR) technology to sense the movement of heat-emitting bodies. Occupancy sensors provide auto-On/Off or manual-On/auto-Off operation while vacancy sensors provide manual-On/auto-Off operation only (CA Title 24 Compliant). The sensors automatically turn lights off after a space becomes vacant and a preset time delay elapses. Both versions provide 1-pole (single-location) and 3-way (multi-location) wiring and work with all lighting load types (INC, MLV, ELV, FLR, CFL, LED). A selectable and dimmable LED nightlight is provided. All sensors are compatible with any decorator-style or decorator screwless wallplate.