Miniature light barriers, W4F, WTB4FP-1G311120ZZZ, switching distance min. / max.: 4 mm / 220 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: push-pull: PNP/NPN, connection type: cable, 3-wire, 2 m, light transmitter: PinPoint LED, light type: visible red light, housing material: VISTAL®, setting: teach-in button, potentiometer