This photoelectric sensor features a powerful alignment aid to ensure the sensors are on target for optimum performance. This listing is for each. Photoelectric Sensor, Sm Series, Perfect Prox Background Rejection, 4 Inch (100mm) Sensing Range, Visible Red Beam, 10-30 Vdc, Cable, Npn And Pnp Output, Lightoperate Cat: CUTE65SMPP100HL Item: 0578082 Cat: E65-SMPP100-HL UPC: 782114389553 Category: IP/NEMA Rating: IP68, IP69K NEMA Configuration: 1, 12, 4, 4X