This atomic clock has 1.75 inch high time-telling numbers and also shows the date, day of the week, and temperature. For desk or wall use. Blue backlight on demand for comfortable nighttime viewing. Buttons on top for easy setting. Automatically sets itself from the signal from the National Time Observatory in Boulder, CO. Silver color. Measures 7.25 inches wide x 4.625 inches high x 1.25 inches deep. Uses 2 AA batteries (not included).