Groclock™ sleep trainer and alarm in one was designed for children to teach them how to distinguish the time of the day thanks to the animations displayed on the dial. Suns (daytime) or stars (night time) visible on the dial start to disappear with the passing hours, so that your little one knows when the day or night time is coming. Option of setting two alarm clocks (eg. for week/weekend or night sleep/daily nap). Parental lock - the child will not change the settings already set by the parent.