ALTUS. Radio Controlled. Solid wood case, mahogany finish. Glass lens. 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 included. H:7.5'' W:10'' D:2.75''