The Atomic Bell Alarm Clock is a loud alarm clock designed for use by individuals who are hard of hearing. This clock has a loud bell alarm and the analog display automatically sets to the world atomic clock. Other features include luminous hands, large numbers (0.5 inch high) that are designed to be easy to see, and a snooze button. POWER: Uses one C battery (not included). DIMENSIONS: The clock is 7 inches high, and the face is approximately 3.675 inches in diameter. WEIGHT: 13 ounces.