Round light barriers, GR18, max. switching distance: 0.03 m ... 7.2 m, sensor principle: reflection light barrier, detection principle: double lens, switching output: PNP, switching type: light/dark switching, connection type: cable, 4-core, 2 m, light transmitter: PinPoint LED, setting: potentiometer, communication interface: -, included in delivery: fastening nut (2 x)