The Retroreflective sensor contains both the light source and receiving device in one housing . A unique dual lens system or bifurcated fiber optic light guide establishes the transmitted light beam path and the returned light beam path on the same axis. Specification: Brand: Pepperl + Fuchs Sensor Style: Barrel Detection Type: Retroreflective Detection Range : 4 m Output Type: PNP Electrical Connection: M12 4 Pin Connector Maximum dc Voltage: 30V Light Source: LED Maximum Current: 100 mA Package includes: 1 x Retroreflective sensor OBS4000-18GM60-E5-V1