This is an Omron EX3-NA series 12 to 24VDC optical fiber photoelectric sensor. Its part number is E3X-NA11. This item is new and has never been used. It comes as pictured and does not include any additional parts or accessories.  

It comes as pictured and does not include any additional parts or accessories.

Specifications:

• Brand: Omron Automation and Safety
• Part Number: E3X-NA11
• ROHS: Yes
• Sensing Distance: 200mm
• Series: E3X-NA
• Output: NPN
• Connection: 3-wires