The Omron E2A-M18KN16-WPB1 is an M18 inductive proximity sensor with a 16 mm sensing range, PNP normally open output, and non-flush mounting. It operates on 12-24 V DC and comes with a PVC cable connection; the brass housing gives it durability in industrial environments.
The 16 mm sensing range is the maximum detect distance for a standard mild steel target when the sensor is non-flush mounted — meaning the face can be recessed into metal without reducing range. The PNP (sourcing) output is compatible with most PLC sinking inputs; normally open means it closes when target is present. Supply voltage is 12-24 V DC, so it fits common control voltages without needing a dedicated supply.