I have been given the alarm 25 months ago. The operation of the keys turned out to be getting used to. They tend to jam if you do not plan pushes centrally and then remain in the pressed state. The display can be read in the dark really only from a very short distance. After a longer adjustment period, I found the alarm clock but then satisfactory. After about 18 months, I noticed that the alarm function shortly after 6 clock in the morning did not let off. The alarm clock is set to 6:10. If I'm awake before I would naturally turn the alarm off before I leave the bedroom. A glance at the manual explained the phenomenon. The alarm clock at 3:00 tries to receive the time signal. It does not work, he tried it again at 4:00 and at 6:00. Each of these tests takes 10 min. During this time you can, other than the disconnection of the alarm signal (when it beeps), perform no operations. Over the last 7 months, the clock received the time signal becoming increasingly rare, now no longer, what manifested itself in a deviation of the time display over the two operated in the same room clocks; View the full signal strength. So I screwed the unit times. I discovered two button cells, which are brazed by being punk Teter contact lugs on the board, so that a simple exchange is not possible. When a button cell is a solar battery which is charged by the solar cells, the other serves as a backup battery if the battery is empty. The voltage measurement showed that the malfunction is probably caused by a defect of the receiving module. In this case, the life of the batteries was higher than that of the electronics.