Retrofit kit for E39 auto leveling headlights.
Installation instructions are included but also available online.
https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://etk.club/eba_docs/276en.pdf&ved=2ahUKEwj0xb3wwI-FAxVQDzQIHcQEBuMQFnoECBAQAQ&usg=AOvVaw0VxFtUB9RHH63sXB8jxGz9