Photoelectric Sensors (Background Rejection, Tubular Style): Type - Inductive Proximity, General Purpose Sensor; Sensing Range - 4 mm; Voltage - 26.5-31.9V DC; Wires - Voltage Type - 2-Wire DC; Shielding - Shielded; Output Mode - N.O. or N.C.; Connection Type - Connector, 4-pin; Connection Size - M12 x 1; Construction Style - Tubular, Threaded; Diameter - 12 mm Dia.; Material - Stainless Steel; Enclosure Rating IEC - IEC IP67; Switching Frequency - 500 Hz; Temperature Rating - -25 deg C (-13 deg F) to F470 deg C (158 deg F); Material - Face - Nonmetallic