Contemporary atomic clock is ideal for your large work space, where accuracy is a must. Radio-controlled movement corrects time each day, and changes hour hand in Spring and Fall automatically. Design also features a UV-protected lens, white non-yellowing 14-1/2" with large Arabic numerals, black hour and minute hands and a red second hand. 16-1/2" clock body is made with recycled content. Clock runs on one AA battery (sold separately).