The Gro-Clock teaches children when it's time to sleep or get up using pictures of the moon and sun. It also comes with a beautifully illustrated book for children to read which helps to encourage children to stay in bed. The glowing screen shows images of moon and sun to communicate sleep and wake-up time to children and stars go out one-by-one during the night to show the passing of time. It has an adjustable screen brightness, a silent option, optional digital clock and alarm feature. The Gro Clock comes with an educational bed time story book called Sleepy Farm to reinforce the message of getting a good night's sleep. The clock is mains powered and suitable for children from 2 years.