Loud for Heavy Sleeper: Designed with twin bells, the sound is loud enough to wake you up from dead sleep, very suitable for visually impaired, elderly or student. To be a punctual person, never be late. Silent Movement: After being operated by 1 x AA carbon-zinc battery, the silent analog alarm clock uses superior precise quartz movement, non-ticking for light sleepers . (Analog clock alarms are not accurate to the minute, usually the error within 5 minutes is normal, please understand.) Easy to read in the dark: press the night light button, manual light will shine all over the dial that the time is clear to see. The light is soft and energy efficient. Modern and Cool Design: High quality ABS back cover, sturdy metal bells and red metal frame make up this alarm clock. Wide Application: Dimension in 8cm , a practical and modern addition to the bedside, table and shelf. It really is a great birthday or festival gift!