Atomic clocks are the perfect timekeeper, and are set according to the U.S. atomic clock. A radio signal automatically synchronizes atomic clocks to one of the atomic clocks maintained by the U.S. government, so they are always correct, down to the second, with no need to provide other adjustments.
• Silver brushed metal case
• Accurate to the second
• Dimensions: 14.5" diameter x 2.3" depth