Deluxe Indoor/Outdoor Atomic Clock, 13 1/2", Black Frame, White Face

Weather-resistant case is perfect for high-humidity or outdoor areas. Large numerals are easy to read from a distance. Accuracy assured through radio contact with the National Bureau of Standards atomic clock in Boulder, Colorado. Time Format: Standard; Power Source(s): Requires one AA battery (sold separately); Movement Type: Quartz; Overall Diameter: 13 1/2".