Radio-controlled Clocks

"How they work"

Radio controlled clocks do exactly what clocks are meant to do:  Indicate absolutely precise time.  All the time.   Through the most remarkable technology breakthrough in 30 years, radio-controlled clocks are linked to the most accurate clock in the world, the U.S. Atomic Clock.

The U.S. Atomic Clock, which is managed by the National Institute of Standards and Technology (NIST) - Time and Frequency Division, is America's "paragon of precision".  This clock measures each second of time as 9,192,631,770 vibrations of a cesium-133 atom in a vacuum.  This makes the U.S. Atomic Clock accurate to within one second every million years.  This Clock sends out a signal at 1:00 am.  This signal is received by the radio-controlled clock which resets itself to the exact microsecond. In fact, it sets to the exact time within 20 nanoseconds!   They will adjust for time zones, leap year, and can be reset in a moment by pressing a single button.