Atomic Digital Clock Auto Set (no back light) - Using radio frequencies broadcast from NIST’s Colorado , the clock will automatically set to the correct time. Automatically adjusts to Daylight ...

LARGE DISPLAY: Easy to read 4″ high display SELF-SETTING/ADJUSTING: Using radio frequencies broadcast from NIST’s Colorado Atomic Clock. (Atomic feature only ...

An ESP8266 Module and an Arduino sketch replace the WWVB radio receiver in an Atomic Clock to synchronize the clock using NTP.