Adjustable sensing distance: 10 cm to 100 cm. Turning the knob clockwise increases the sensing range (far), turning counterclockwise decreases it (close). The knob cannot rotate 360 degrees. Sensing principle and construction: Noncontact infrared sensor with an MCU circuit produced in Taiwan. Uses the diffuse reflection principle of infrared light on objects. When a person or object enters the sensing area, the sensor outputs a signal, and the output is turned off after the person or object leaves the sensing area. Benefits and performance: Enables hands, contactless triggering for safer, cleaner operation. The adjustable range helps tailor sensitivity to the environment, reducing false triggers. The Taiwanmade MCUbased design supports stable, reliable presence detection using infrared diffuse reflection. Compatibility and integration: Suitable as a sensing module for automation, lighting, display, and small equipment control systems that require noncontact presence detection. Designed to be integrated into existing control circuits that accept a signal output from the sensor. Use scenarios: Entrance lighting: automatically turn on lights as a person approaches and switch off after leaving. Retail or exhibit displays: activate product information screens or lighting when a shopper stands in front of a display. Small workshop or office automation: control ventilation, fans, or other equipment based on human presence in a room or area.