Be ready for a day of exploring outdoors with our atomic alarm clock that projects the time and outdoor temperature on the ceiling with the touch of a button. The backlit LCD display includes time, day and date, indoor/outdoor temperature, and phase of the moon. Includes outdoor temperature sensor and AC adapter.
In the U.S., the accuracy and speed that your clock and watch will receive signal updates depends on your proximity to the U.S. atomic clock in Fort Collins, CO. This means that the majority of personal atomic clocks and watches will synchronize only within the continental United States, and may not synchronize correctly in Hawaii or Alaska or on continents other than North America. Personal atomic clocks and watches work only in some areas of Canada and Mexico.
Another limitation of personal atomic clocks and watches is that they may not receive the NIST (National Institute of Standards and Technology) signal within large buildings containing steel construction. Moving clocks and watches closer to windows in these types of buildings will usually resolve the synchronization problem.
Five AAA batteries (two for sensor, three optional for receiver), not included. Approximately 3 1/2"W x 7"L x 2 3/4"H.