FF-SDER11A2 FF-SD Series, Safety Sensitive Edges Emitter and Receiver, Safety Category 4, 0.4 m to 10 m [1.31 ft to 32.8 ft] Scanning Range, 12 Vdc supplied by the control unit, Diameter 11,5 mm/Length 37 mm [Diameter 0.45 in/Length 1.46 in], Pre-wired, IP68