AWESSOME SAUCE.
Thank you, particlewave! ...I had no doubt, you could answer that one.
The device is a:........................
automatic "headlights/low beam" Controller, including a neat "coming home" function (keeps the lights on for a defined period of time, 20-40 secs, even after locking the car).
Turns on the low beam whenever a "self-defined Darkness" is recognized. You can leave the regular switch in the default position and the device (when turned on) takes over control. When it is getting brighter, it turns off the lights again.
As soon as the regular switch is turned on, it has priority, of course.
It is licensed, with a patent and an E9 and CE certification, "street legal".