Prophetic magic has long been a major branch of magic, and such shows always give audiences the best impression. and of course the Prophetic Clock was one such item
The magician shows the audience a model clock that can use his hands to adjust the hands to his liking. then he asked the audience to rotate the clock until a certain time. after the adjustment is complete, the audience lids the watch cover and the magician will guess what time the audience chooses
Oddly enough, the magician somehow knows what the audience chooses while he doesn’t open the test lid.