Photoelectric Sensors (Background Rejection, Tubular Style): Type - Photoelectric Retroreflective Sensor; Sensing Range - 21.3 ft (6.5m); Voltage - 10-30VDC; Output Mode - Dark Operate; Output Type - NPN; Connection Type - Cable; Connection Size - 6.5ft (2m); Construction Style - Tubular w/Flat Sides, Threaded; Diameter - 18mm; Sensing Position - End; Material - Plastic; Response Time - 1ms; Beam Type - Visible Red; Enclosure Rating IEC - IEC IP67