The Timex TK321 Sleep Training Alarm Clock makes it easy for kids to understand the difference between sleep and wake time. When the clock glows red it signifies to your child it's time to sleep, when it turns yellow it means it is almost time to wake, and when it turns green it means it is ok to get out of bed. Choose from white noise or nature sounds to lull your little one to sleep, and use the built-in night light to illuminate your child's bedroom.