SensorWorx SWX-121-BK Dual-Tech Wall Switch Occupancy Sensor 120–277V, Black

Product Overview

The SensorWorx SWX-121-BK is a line-voltage wall switch occupancy sensor designed for automatic lighting control in commercial environments. Operating on 120–277V, it combines passive infrared (PIR) and acoustic sensing to detect occupancy and automatically switch connected lighting loads on and off. Designed for offices, hallways, and enclosed spaces, it delivers reliable hands-free operation while improving energy efficiency.

Key Features & Design

• Functionality: automatically controls the connected lighting load based on occupancy using dual-technology sensing, with a manual override for immediate user control.
• Installation context: wall‑mounted device designed for commercial lighting systems; integrates into existing wall boxes and line‑voltage circuits where occupancy sensing is desired.
• Notable specifications: Control type:  120–277V AC operation; dual-technology sensing (PIR + acoustic); wall-to-wall (~180°) coverage; switching control (no dimming); single-gang wallbox mounting.
• Contractor-relevant details: Interchangeable line/load wiring simplifies installation; supports both neutral and no-neutral configurations; shallow design (<1” depth) fits crowded wallboxes; dual-technology sensing improves reliability in complex spaces.

Performance / Benefits

In real-world commercial settings, the SWX-121-BK reduces energy waste by turning lights off in unoccupied spaces and quickly restoring illumination when occupancy is detected, without sacrificing occupant convenience thanks to its manual override. Its dual-technology sensing helps improve detection reliability in environments where motion alone may be infrequent or ambient noise levels vary, making it well suited for offices, corridors, meeting rooms, and other shared spaces where consistent lighting control is valued.