E18-D80NK 5V Adjustable Infrared Proximity Sensor Switch 3-80cm (sensor body is about 45mm)
The E18-D80NK is a widely popular, low-cost infrared (IR) proximity sensor switch used extensively in automation, robotics, and obstacle detection. It combines an IR transmitter and receiver into a single cylindrical, threaded housing, allowing it to detect objects within an adjustable range of 3 cm to 80 cm