At first I had the free demo version. Allegedly the max. Number of Weckmöglickeiten achieved and I had doubts as to whether the alarm would wake me yet. So I've bought the paid version. That was initially angry because I suddenly had stupid commercials when I at night anmachte the Kindel to look at the clock. That was also in some reviews. So I was really disappointed. After a few weeks it was over, however. For whatever reason. What I really think is good, is that one night if you have unlocked the Kindle can read the time on a dark display in blue (as shown), without being slain by the brightness and is instantly awake. Operation is intuitive and very simple, the set of my alarm pleasant. The app works so far 100% reliable.