See the world's most accurate time, indoor/outdoor temp, day and date at a glance! Huge savings on a high quality atomic wall clock with indoor/outdoor temp! This clock accepts radio signals from the U.S. atomic clock and resets itself daily for accuracy of one-millionth of a second. Also displays indoor/outdoor temperature, temperature trend and day/ date. Features 12/24 hour time display options, Celsius/Fahrenheit temperature select, alarm clock with snooze, automatic updates for daylight saving time, large 2-1/4 clock digits and backlit LCD. Comes with wireless remote temperature sensor. 7-3/4 x 11-1/2 x 1. Two 'AA' and two 'AAA' batteries (not included).