Omron E3S-LS3N 2M Limited Reflective Photoelectric Sensor

That means it's built for retroreflective detection but with a constrained sensing window, often used where a precise cutoff is needed and standard retroreflective would pick up background reflections. 2M indicates a two-meter cable pigtail. No additional specs on sensing distance or output are listed here, so if your BOM calls for a specific range or NPN/PNP polarity, you'll want to confirm the full datasheet before committing the line.