Balluff BOS 15K-R-B2-P-S75 retroreflective sensor. This is a type of photoelectric sensor used in industrial automation for object detection.
Shopping and product information:
The sensor has an operating voltage range of 10-30 V DC.
It has a maximum sensing range of 2 meters.
The output function is PNP (normally open/normally closed).
It uses an M8x1, 4-pin connector for connection.