Atomic Alarm Clock 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 & Technology (NIST) in Fort Collins, Colorado. The Atomic Clock will always be accurate to within one second as it receives daily WWVB updates. Display Nightlight with ON/OFF Switch The Display nightlight is visible in the dark, providing a low light glow. This makes the display easy to read but dim enough not to disturb. Note: The display nightlight will not be visible in a well-lit room. Calendar & Day of Week Display Always know what day it is at a glance. The clock displays the calendar and day of week. Indoor Temperature Display Get the real-time indoor temperature of your home displayed on your clock. Battery operated self-setting digital wall or desk clock Easy to read color display with a nightlight feature Displays indoor temperature for real-time monitoring Calendar and day of the week display for convenience Automatically synchronizes with the WWVB radio broadcast for precise timekeeping