This sandglass is simple to use. Children can use it themselves. Just turn the timer 180 degrees and you'll know the time is up when the sand reaches the bottom of the sea. So this is a very suitable time tool for children to use in study and life, very easy to help children understand the time and arrange the learning. The hourglass is a fun way for children to judge the time as they complete a task. It is useful to control children's time. Give your child a time frame for how much time they need to learn, play, sleep, etc. It keeps the attention of kids of all ages! Perfect for brainstorming in the classroom, having breakfast at table, watching cartoon, teeth brushing, washing hand, playing a game, etc.