Features 1. Digital Teaching Chapter: Addition and Subtraction, interesting drawing, number 1-100. Give your children or your friend kids a funny and meaningful gift! 2. Rotary Adjustment Design: Ten different queue modes can be adjusted. Satisfy all addition and subtraction within numbers 1-100. Develop children's logical calculation ability. 3. Efficient And Fast Math Problems: You can quickly prepare math problems for your child at home. You can quickly complete the quiz by simply scrolling the math problems. 4. Reusable: Small and exquisite, easy to carry, add ink for repeated use. 5. Best Gift: Keeping the children busy and get a moment of silence for yourself when you need. So, this is great gift for our children, even for parents. Specification Material: Plastic Color: Pink, Blue Size: 4 x 3 x 5 cm Weight: 40 g Pattern: Subtraction stamp, Addition stamp Package Include: 1× Digital Teaching Stamp(No Ink) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.