1. [ATOMIC DIGITAL CLOCK AUTO SET]: The atomic desk clock automatically receives Colorado radio time signals, syncs with WWVB radio broadcasts, and updates with accurate time and date. Atomic clock will always be accurate to within one second as it receives daily WWVB updates. 4 time zones to choose between PST, MST, CST, EST. 2. [ALARM CLOCK WITH SNOOZE]: Atomic alarm clock to meet daily wake-up needs, snooze function. Alarm status also shows on the display for easy check. In snooze mode, press any key except SNZ/LG to exit. 3. [ATOMIC DESK CLOCK WITH BACKLIGHT]: Powered by 3 AAA batteries (included) . Press the SNZ/LG key to light up the backlight for 10 seconds. 4. [SETTING TIME ZONE]:After the waveform icon flashes, it means that the RCC clock has ended the wave receiving mode. At this time, press the "UP" key to select the time zone. The modern design of the full screen clock makes it the perfect gift for your loved ones.