Seththomas Radio-controlled challenger lcd wall clock Radio-Controlled Challenger LCD Wall Clock, 11-7/8" dia. x 2-1/4d, Black Case Phenomenally accurate to within one second over one million years. Features the ability to receive the cesium atomic clock (WWVB) signal from the National Institute of Standards. Automatically resets for daylight savings time, saving you time. Radio controlled anywhere in the contiguous U.S, meaning you can travel and still know what time it is! Extra large, easy to read 8 x 5 LCD display of 12 or 24 hour time, day/date and temperature.