This is a high performance EASY Plug photo interrupter module.
The upright part on the module combines an infrared light emitting diode and shielded infrared detector.
By emitting a beam of infrared light from one end to another end, the sensor can detect an object when it passes through the beam.
Useful for many applications such as optical limit switches, pellet dispensing, general object detection, etc.
This module needs to be used together with EASY plug control board.