Miniature light barriers, W4SL-3V, WTB4SL-3P3462V, switching distance max.: 25 mm ... 300 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: cable with M12 connector, 4-pin, 150 mm, light transmitter: laser, setting: teach-in button, laser class: 1