The Atomic clock synchronization*, via a sensitive antenna concealed in the clock, communicates in the background with the National Institute of Standards and Time (NIST) radio broadcast of split-second accuracy time information. This ensures accurate synchronization from any location.
Time is synchronized several times per day. A useful feature of Atomic clock synchronization is that if the clock hands are moved to display a particular chime or piece of music, the atomic clock will return the time automatically to the correct time.
*NIST is not available everywhere