Miniature light barriers, G6, GTB6-F4421V, device type: light sensors and light barriers, switching distance max.: 5 mm ... 420 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: connector M8, 4-pin, light transmitter: LED, light type: infrared light, housing material: stainless steel V4A (1.4404, 316L), setting: potentiometer