Features: Easy to Use: Rotate the gear to change the question in a second. The upper gear changes the number before the operator, and the lower gear changes the number after. Slide the panel below to switch operation symbols. Economical and Environmentally Friendly: This tool allows for a paperless defense, eliminating repetitive answers, saving paper and protecting forests. It's small and portable, perfect for engaging practice anytime, anywhere. Quality Material: The casing is hard enough to withstand falls, making it more drop-resistant and wear-resistant. The product list includes 1 arithmetic learning generator, 2 whiteboard pens, 1 erasable cloth, and 1 storage bag. Adjustable Difficulty: With a large amount of questions of variable difficulty levels to choose from. We have mixed addition and subtraction problems from 1-30/1-50/1-100/1-200 as well as mixed multiplication and division problems from 1-50/1-100. You can purchase a suitable question generator according to your needs. Ignite Children's Computation Passion: Includes addition, subtraction, multiplication, and division tests. Whether you're teaching in a classroom or at home, these tools can help stimulate their enthusiasm for learning! Specification: Model Number: Arithmetic Practice Writing Pad Material: ABS Product Size: 13.2x4.4cm Optional Type: 1~30 Addition & Subtraction, 1~50 Addition & Subtraction, 1~50 Multiplication & Division, 1~100 Addition & Subtraction, 1~100 Multiplication & Division, 1~200 Addition & Subtraction (Optional) Package Size: 14.9x8.1x1.6cm/5.8x3.1x0.6in Package Weight: 74g/2.6oz Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Packing List: 1 x Question Generator 2 x Whiteboard Pen 1 x Flannel Storage Bag 1 x Wipeable Cloth