3mm photoelectric sensor with built-in amplifier for narrow installation

As the world leader in compactness among photoelectric sensors, the EX-Z series boasts a dimension of 3mm by utilizing new semiconductor packaging technology without wire bonding. The ultra-small unit size allows for installation of sensors in narrow spaces where only a conventional fiber sensor head could be installed before. 
Sensing range from 50mm to 500mm.

https://www.youtube.com/watch?v=QDo0EofYc_c&t=3s