Brain Training Device: This Brain Arithmetic Machine enhance various brain functions such as mental arithmetic, memory, focus, and reaction speedInteractive Learning: The Electronic Calculator features irregular number key arrangements for diversified left and right brain interaction trainingProgressive Challenge Levels: The training challenges are divided into five levels beginner, intermediate, advanced, , expert with 72 stages in total and a database of 60 million questions It offers progressive learning from easy to difficult levels Portable: Convenient and portable, Maths Teaching Calculator Toy for playing in. cars, airplane, travelTime Limit Problem Solving: This Electronic Math Game offers time limit problem solving exercises with intelligent question generation for advanced challenge training sessions making it a wise choice for parents who want to boost their child's intelligence Specification: Material: PP Size Chart: 26.2X20X33.4CM/10.31inchX7.87inchX13.15inch Package Includes: 1 Electronic Calculator