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Radio Controlled.Solid Wood Case, Mahogany Finish.Most Accurate Movement Available.Never Needs Setting.Picks up low frequency radio signal from U.S. Atomic Clock in Fort Collins, Colorado, which sets correct time automatically.Sets to all U.S. Time Zones.Automatically adjusts to Daylight Saving Time and back to Standard Time.2.5 x .5 Brass Engraving Plate.One AA Battery .Atomic clocks are accurate if able to pick up the low frequency radio signal from the U.S. Atomic Clock in Fort Collins, Colorado. Some buildings and terrain may block the signal. If you can use a cell phone in the room you plan to use the clock, you should be able to receive the signal and the correct time will be set automatically.Height: 7.5 x Width: 10 x Depth: 2.75