Retroreflective sensor RL28-54-G/47/115 RL28-54-G/47/115 SICK transparent objects, like clear glass, PET and transparent films TEACH-IN switch for adjusting contrast detection levels Self-adjusting in case of dirt in contrast detection mode Powerful LEDs for power-on, weak signal, and switching status Flashing power-on LED in case of a short-circuit Insensitive to ambient light, including energy-saving bulbs Waterproof, protection rating IP67 Protection Class II