The clock is a gift from Dumbledore. On the one hand, it could be recording. On the other hand it could be transmitting. On the gripping hand, Dumbledore has a Time Turner.
If Dumbledore wanted to assure that any time he was the best pressure-release for a prophesy that pressure was released as easily and discretely as possible and less likely to be overheard, he would want to make it easy for the Prophesy Force to get that information to him.
So he gives her a clock and tells her to ask it for the time each time she wakes up in the middle of the night. The clock tells Dumbledore. Dumbledore gets invisible. Then it's just a jump to the left and he receives any prophesy intended for him.
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Suggestion: the person who memory charmed Rita Skeeter was Gilderoy Lockhart, who was the most famous master of Memory Charms ever mentioned in canon.