Dimensions: 5.75L x 1.25W x 4H inches. Portable gray alarm clock with dial light. Automatically sets to U.S. Atomic Clock. Adjusts for Daylight Saving Time and Standard Time. Illuminated face. Calendar and snooze functions. Requires 2 AA batteries (included). One of the most accurate alarm clocks you can find. The only time you need to set is the alarm. The Get Up and Glow Alarm Clock by Seiko receives low frequency radio signals from the U.S. Atomic Clock in Fort Collins CO which sets the correct time automatically. It sets to all U.S. time zones and automatically adjusts to Daylight Saving Time and back to Standard Time. This digital clock offers a calendar feature that will also adjust automatically. Depress the button on the top of the clock to make the dial light up to a light blue. The dial will stay illuminated for five seconds to provide easy viewing in a dark room. The alarm is an ascending beep. There is a snooze function. Includes 2 AA batteries.