Round light barriers, V180-2, VTE180-2P41147, switching distance max.: 1 mm ... 500 mm, sensor principle: reflection light sensor, detection principle: energetic, switching output: PNP, switching type: light/dark switching, connection type: cable, 4-wire, 2 m, light transmitter: LED, setting: potentiometer, included in delivery: fastening nut (2 x)