Like ordinary analogue watches/clocks, a radio-controlled watch/clock with an analogue display is affected by magnetism. Even after the radio-controlled watch/clock has successfully received radio waves, it may not be able to display the correct time.
For more details, please refer to “Q&A regarding watches/clocks Q14.”
For those who already own a radio-controlled watch/clock, refer to the instruction manual that came with your watch/clock as specifications vary depending on manufacturers and products.
(Note): The above information applies to members of the Japan Clock & Watch Association and their products.