La Crosse Technology Curved Digital Atomic Wall Clock La Crosse Technology atomic clocks set the time and date automatically. Atomic clocks synchronize to a radio signal called WWVB that the National Institute of Standards and Technology (NIST) broadcasts continuously from Fort Collins Colorado. When connected to WWVB signal this Curved Digital Atomic Wall Clock will display precise time and date as well as automatically update for Daylight Saving Time changes (on/off option).