The Atomic Analog Clock from La Crosse Technology is easy to read, keeps accurate time and requires little maintenance. This radio controlled clock features an internal antenna that is tuned to a radio signal regulated by the National Institute of Standards and Technology’s atomic clock – the most accurate in world. After you insert one “AA” battery and choose your time zone, the clock automatically searches for the radio signal and sets itself to the precise time. Makes a nice gift! Features: 14" Diameter Atomic time with manual setting Automatically sets to exact time Accurate to the second Automatically updates for daylight saving time (on/off option) Four time zone settings Requires one "AA" alkaline battery (not included) Great gift idea