Automatically receiving a daily radio signal, this self-setting large screen clock offers precise time--to the second! Features large, easy-to-read face displaying time, temperature, day, date and time zone. Big screen atomic clock has an alarm that includes 5-minute snooze. Uses 2 AAA batteries; not included. 5 1/2" wide x 3 1/2" deep x 2 1/4" high. Self-setting functionality works only in the following US time zones: Eastern Standard Time, Central Standard Time, Mountain Standard Time and Pacific Standard Time.