The D4NL-4CFG-B is an Omron Digital Miniature Photoelectric Sensor. It is a high-precision, long-range detection photoelectric sensor that is ideal for applications with power source constraints. It has a detection range of up to 10 m and an accuracy of up to 0.1 mm. It is also able to detect objects up to a resolution of 0.001 mm. The sensor has a wide range of applications including food, beverage, electronics, and automotive industries.