Miniature light barriers, W4SLG-3V, WL4SLG-3P2432V, switching distance max.: 0 m ... 4.5 m, sensor principle: reflection light barrier, detection principle: autocollimation, switching output: PNP, switching type: light/dark switching, connection type: M12 connector, 4-pin, light transmitter: laser, setting: teach-in button, laser class: 1, communication interface: -