Photoelectric Sensors (Reflex-Reflective, Limit Switch Style): Sensor Type - Photoelectric Reflex; Sensing Range - 18-ft (5.5m); Wires - Voltage Type - 2 Wire, 20-264V AC/DC; Connection Type - Screw Terminals; Connection Size - 1/2"NPT; Output Mode - N.O. or N.C.; Construction Style - Limit Switch Style, Modular; Enclosure Rating NEMA - NEMA 3,3S,4,4X,6,6P,13; Response Time - Standard; Manufacturer Series - E51 Modular