Wall sensors typically use passive infrared (PIR) technology to detect heat from people moving within a room, then wirelessly signal compatible dimming or switching devices. In occupancy mode, the sensor can turn lights on when motion is detected and turn them off when the room is vacant, while vacancy mode requires someone to turn the lights on manually and lets the sensor turn them off after the space is unoccupied.

Review local code requirements, the sensor’s wall-mount location, and its coverage area, keeping the sensor within line of sight of compatible lighting controls when possible. Confirm the control distance, which may be up to sixty feet in line of sight or thirty feet through walls, and verify that the wireless sensor is compatible with the dimmer or switch it will control.

Check the wall sensor’s specifications for compatibility with the existing switch, dimmer, lighting load, and control system, including whether it requires a compatible wireless receiver or hub. Confirm communication range, mounting location, and system limits, then follow the manufacturer’s wiring, pairing, and programming instructions before installation.

Coverage angle determines how much of a room a wall sensor can monitor, while placement on a wall or corner affects whether moving people remain within the sensor’s passive infrared detection area. For wireless wall sensors, position the unit with a clear view of the space and keep compatible dimmers or switches within the supported communication distance, since walls and obstructions can reduce the effective range.