A fully sealed, weather-resistant case & large, easy-to-read numerals on its face make this clock ideal for high-humidity, outdoor environments. As it maintains radio contact & automatically synchronizes with the National Bureau of Standards' atomic clock in Boulder, Colorado, it can be relied upon for up-to-the-minute accuracy & precision. For added convenience, it also automatically syncs up with Daylight Savings Time changes within the continental US time zones: Eastern (EST), Central (CST), Mountain (MST) & Pacific (PST). Display Type(s): Analog; Movement Type: Radio-Controlled (RCC); Time Format: Standard (12-Hour); Shape: Round.