This part is a kind of semiconductor called CX-491.
Function of this product has Photoelectric Sensor.
Manufacturers : Sunx
Image and pinout :
Some of the text within the PDF file :
INSTRUCTION MANUAL Photoelectric Sensor Amplifier Built-in Thank you very much for using SUNX products. Please read this Instruction Manual carefully and thoroughly for the correct and optimum use of this product. Kindly keep this manual in a convenient place for quick reference. ٨ Never use this product as a sensing device for personnel protection. ٨ In case of using sensing devices for personnel protection, use products which meet standards, WARNING such as OSHA, ANSI or IEC etc., for personnel protection applicable in each region or country. 3 MOUNTING ٨ The tightening torque should be 0.5N㨯m or less. M3 (length 12mm) screw with washers Sensor mounting bracket (Optional) CX-400 Series 1 SPECIFICATIONS Type Model No. NPN output (Note 1) PNP output Thru-beam L [ ... ]