Small light barriers, W12, WT12L-2B550A02, device type: light sensors and light barriers, switching distance max.: 50 mm ... 290 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, NPN, switching type: light/dark switching, connection type: M12 connector, 5-pin, light transmitter: laser, light type: visible red light, setting: potentiometer