Photoelectric Sensors (Reflex-Reflective, Limit Switch Style): Sensor Type - Photoelectric Reflex Polarized; Sensing Range - 15-ft (4.5m); Wires - Voltage Type - 4 Wire, 120V AC; Connection Type - Screw Terminals; Connection Size - 1/2"NPT; Output Mode - N.O. and N.C. (complementary); Construction Style - Limit Switch Style, Modular; Enclosure Rating NEMA - NEMA 3,3S,4,4X,6,6P,13; Response Time - Standard; Manufacturer Series - E51 Modular