My husband and I wanted to invent a "getting-traffic" in order to achieve endurable Aufstehzeiten! A quick look on the internet and yippie ... there is already something. Despite the relatively high price, I immediately ordered the Gro-clock. In the first few days the whole thing did not work and I was inclined to separate me again of the clock. But after this short run time, it's going great. We had initially set a realistic time and after our children (2 1/2 and almost 4 1/2) had then even "understood" it and not again before "around gymnastics", we have always made it further 5 or 10 minutes, at bedtime expand further. This works fine (even our younger child, knows that peace is, until the sun has risen). It will of course not achieve utopian Aufstehzeiten! But I have already up to an hour more rest! The only drawbacks: - The search for an outlet in "close view" is designed a little more difficult. However, I am also not a fan of it, to dispose of mountains of empty batteries, so battery operation time would have been no solution. So, okay. A To hang on the wall might have been helpful. In many places, we have taken into consideration, outweighed the fear that a child at some point down the clock sweeps off the shelf or anywhere else. - The brightness can be adjusted, but only for the blue indicator / the star to sleep. This we have to "1" (ie lowest level!) Set. This is for children who do not need a nightlight already plenty of light! And the sun is always on in all its glory, is not regulated, and the room light accordingly. Otherwise, the operation is simple and the "result" just great! I would recommend the clock in any case and also will buy again. A little more sleep one the Euros should be worth! ;-)