The Seiko Aoki is an updated timeless classic. This square beep alarm clock with it's easy to read numbers will delight all owners. You'll also find a quiet sweep second hand so ticking is not an issue, LumiBrite tipped hands for easy read in the dark, snooze and light. Powered by 1 AA battery (included). Overall dimensions: 3.11 X 3.66 X 1.77 inches. All Seiko clocks are equipped with quartz movement making it the most accurate at time keeping.