Features: This math learning toy helps kids improve basic math skills in a more fun way. Kids can always memorize math formulas of phonics games during daily activities. Children gain the joy of success while consolidating their mathematical knowledge. After answering all the questions, the system will automatically review the wrong questions Help children remember unfamiliar knowledge points in time. Convenient and portable, perfect for doing math exercises in the car, on the plane and on the road. br> Engaging, entertaining and learning outside of the classroom. Specification: 100 percent brand new and high quality < br> Color: 4th Generation Red or 4th Generation Yellow or 4th Generation Blue Color (optional) Material: ABS plastic Size: 193x125mm Function: Automatic questioning, automatic correction, Timely answering questions, listening to formulas, number games, hand-painted board Applicable age: 3-18 years old< br> Included in the package: 1 x Electronic Calculator Note: Colors may vary slightly from monitor to display. Please check whenever possible to make sure the item is what you need. Please allow 0.5-1 inch difference due to manual measurement. (1 inch =2.54cm)