Miniature light barriers, W4SL-3V, WTB4SL-3N2462V, switching distance max.: 25 mm ... 300 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: NPN, switching type: light/dark switching, connection type: connector M12, 4-pin, light transmitter: laser, setting: teach-in button, laser class: 1