ULTRA EASY SETUP: Setting up this atomic clock is a breeze. Just select your time zone and plug it in overnight. The clock automatically adjusts time and date using the WWVB radio signal from NIST in Fort Collins, Colorado. It also updates for daylight saving time. Note: The atomic feature operates primarily in North America, typically at midnight or early morning. SHARP COLOR LCD DISPLAY: Features a large, white backlit display with adjustable brightness for easy reading day or night. The vivid digits show time, date, day, indoor temperature, humidity, and real-time moon phases. ALARM WITH SNOOZE: Ideal for bedrooms or offices, this alarm clock includes a convenient snooze button for extra sleep. It also has an electronic calendar function and provides accurate indoor temperature readings, making it versatile for various settings. BUILT-IN BACKUP BATTERY: Primarily powered by an AC adapter, the clock includes a CR2032 cell battery to store time and alarm settings during power outages. A low battery warning will alert you when it needs replacement. Note: The clock requires plugging in to function, with the battery for backup only. ADJUSTABLE BACKLIGHT: Offers brightness settings of 100%, 50%, 3%, or off to ensure comfortable use. This atomic self-setting clock is the perfect choice for your office or nightstand. Color: Black.