Retroreflective sensor ML9-54-G/25/136/143, Retroreflective sensor with polarization filter for clear object detection, Retroreflective Sensors, Ultra bright LEDs for power on, weak signal indication and switching state, Flashing power on LED in case of short-circuit, TEACH-IN, Automatic adjustment in case of soiling in contrast detection mode, Not sensitive to ambient light, even with switched energy saving lamps, Protected against mutual interference (no cross-talk), Protection class II