I, like others here, found this clock to not illuminate, even when the room was very dark. I noticed that when I placed my hand near the centre of the clock, it illuminated every time. So I placed a small piece of paper near the centre of the clock and viola! It illuminated! Now it seems to work fine. I couldn't get it to replace the clock, return was the only option and I really need this clock to work because it has the adjustable illumination feature. At least I have a band aid fix for it, might try other things to see if something else works better.
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