The Atomic Clock with 1.5-inch Numbers can be wall-mounted or positioned on a desk or table. Its blue backlight can be turned on on-demand for viewing the time in the dark. Clock also feature day of the week and temperature, and makes for easy alarm setting thanks to the buttons located on the front of the clock. Sets itself automatically from the National Time Observatory in Boulder, CO. Silver and black color. Measures 4.625 inches wide x 5.25 inches high x 1 inch deep. Requires three AAA batteries (not included).