Featuring large 1.5-inch tall numbers, this Atomic Desk-Bedroom Alarm Clock has a super bright blue backlight on demand so you can always easily see the time in the dark. Because it picks up time from the National Time Observatory in Boulder, Colorado you can rest assured the time is always correct! Also features date, day of the week and temperature. Metallic color. Uses 2 "AA batteries (not included). 5 inches wide x 4 inches high x 2 inches deep.