If the hands are twitching or not moving, try a Reset . Some models have a small reset hole you can press with a paperclip, or you can perform a "hard reset" by removing the battery for 10 minutes before trying again.
This can take anywhere from a few minutes to a few days. It is highly recommended to set the clock near a window overnight, as the signal is strongest then. 2. Manual Time Setting ch-899 chouchin radio controlled clock instructions
“Enjoy your accurate time.”