How it works

A signal containing the precise time, day and date, measured by an atomic clock accurate to one second every 20 million years, is sent directly to the watch using standard radio waves. This signal is picked up overnight by the timepiece which automatically adjust the date and time.

Combined with our proprietary light powered Eco-Drive technology, when owning a Citizen Atomic Timekeeping watch you will get precise time powered by any light source.

The element of precision

With a margin of error of just one second in 100,000 years, CITIZEN’s watches receive radio signals from an atomic clock to set the time correctly.

Automatic and convenient

To avoid interference with smartphones and other electronics used during our busy days, our Atomic Timekeeping watches receive radio signals late at night to adjust your watch to the correct time and day.