Press the button on the back for a manual-light illuminated dial; glows across the dial for night time viewing, soft, energy-saving.Hour and Minute hands also have illuminated glow-in-the-dark markings for easy at a glance nighttime viewing. Trouble waking up No Problem! Vowel Twin Bell Alarm Clock is the perfect clock for heavy sleepers, hard of hearing, hearing impaired and hearing loss. Easy to Read Clock Face makes it simple to read while also having illuminated hands for easy to see at night or in the dark. When you can't see the pointer at night,hold the light button, time will be clearly visible.Get rid of the trouble of repeating the winding of the mechanical alarm clock. It is a battery powered alarm clock. The only thing to note is that when the battery is exhausted, don't forget to replace it with a new one. It is powered by 1 AA battery. It was very quiet when it was turned, getting rid of the ticking of the mechanical alarm clock; it also got rid of the trouble of needing to wind the mechanical alarm clock every day.