Sharp Digital Wall Clock, Self-Setting Atomic Desk Clock Woodgrain FinishSharp Digital Wall Clock, Self Setting Atomic Desk Clock with Temperature, Humidity and Date, Battery Operated Digital Clock Large Display, Bronze Woodgrain finish with Gold Bronze Accents. Atomic Accuracy: The Atomic clock has a built in receiver that automatically synchronizes itself with the WWVB radio broadcast by the US Governments National Institute (NIST) in Fort Collins, Colorado. The Atomic Clock will always be accurate to within one second