Powered by 1 AA battery ( not included) with up to 200 days of battery life for long lasting Simple operations with easy rotation to set time from 1 60 minutes, perfect for kids to develop time management skills during study or play Motivational color changes encourage children ' s engagement by providing visual progress feedbacks during tasks Versatile usage for homework, reading, or playtimes limits to help parents organize children ' s daily activities effectively Visual time management features rainbow colorful designs that clearly shows time passing, helping children understand time concepts and improve focus