Miniature light barriers, W4S-3 Inox, WL4S-3N2430V, switching distance max.: 0 m ... 4 m, sensor principle: reflection light barrier, detection principle: autocollimation, switching output: NPN, switching type: light/dark switching, connection type: connector M12, 4-pin, light transmitter: PinPoint LED, setting: none, communication interface: -