All radio controlled atomic watches receive a radio signal from the Cesium atomic clock, the world's most precise clock, accurate to 1 second in 1 million years. The signal is encoded so that it can be transmitted in long wave radio form. The signal originated from the WWVB transmitter in Fort Collins, Colorado and is transmitted one frequency of 60kHz. The atomic watches contain an antenna and internal program to receive and encode the radio signal. It is then decoded to display the precise time. They maintain total accuracy by automatic nightly updates with the radio signal. Junghans watches and clocks may also be manually updated by the user.