Once signal is located, the screen will always be illuminated. NOTE: The screen will go dark while the clock is setting and searching for the Atomic Signal. You can use the Snooze/Dimmer switch on top of the display, to easily adjust the display brightness to your liking. ALWAYS ON DISPLAY – Display is always illuminated.Using the Snooze/Dimmer switch on top of the display, you can easily adjust the display brightness to your liking. The clock displays the calendar and the day of the week. Color Calendar and Day of Week Display – Always know what day of the week it is with a quick glance.Once power is restored, the display will re-light.

During battery back-up the clock’s display will not be lit. The battery back-up stores the time and alarm settings if the power is interrupted.

BATTERY BACK-UP – There is a “No Worry” battery back-up option (requires 2 x AAA battery, sold separately), that will allow the alarm to go off, even if the power goes out.The Atomic Clock will always be accurate to within on second as it receives daily WWVB updates. Color Atomic Alarm Clock – Accurate to the Second! The Atomic Clock has a built in receiver that automatically synchronizes itself with the WWVB radio broadcast by the US Government’s National Institute of Standards and Technology (NIST) in Fort Collins, Colorado.

Snooze/Dimmer Switch is simple to use and on top of the display.

EASY TO SET DUAL ALARM – Set alarm for two people, or set one alarm for weekdays and the other for weekend!.

Atomic digital clock