This VL1B-NFQ40-20NC-SM12 is an inductive proximity sensor with a Q40, PBT body with a Non Flush mounting design. It has a metal body length of 65*40*40 mm and is 2 wire-NC, with a sensing distance of 20 mm and an M12, 4 pins connector. It has a power supply of 10~60V DC and protection rating of IP67. This highly durable sensor is perfect for Industrial Automation applications.