The service is super easy and also to accomplish without reading the Bediensungsanleitung. Completely self-explanatory, you can set the alarm time by finger tap, the light intensity and the Weckgeräusche. A sample function can play in 90 seconds the "Weckzyklus" so that you can test the light intensity / volume.
And that's the really surprising part: I had a fear that the alarm clock just gives too much light, for our small bedroom. But you can adjust the light intensity as individual stages that I do not need sunglasses on the nightstand and'm not awake already fifteen minutes before the alarm time. After a few days I have now found a pleasant setting: I am no longer in a deep sleep when the alarm sounds, but already "spring awake" and that is very pleasant.
3 of 5 alarm sounds I do not feel as nice (Zen garden, piano and sounds of the sea), for the forest sounds and (my favorite) are the bird sounds sensational! Played the alarm now even the birdsong that I hear in the spring / summer front of the bedroom window, that would be the icing on the cake. But even so, the alarm is super nice and makes a good mood!
All in all I think it's Wake-Up Light super for the dark season and am glad to have finally bought. In the bright season it sure brings me not so much - but there is then also the real sunrise and the birds genuine front of the house!
