Brain Improvement Device Digital Roller Teaching Stamp Math Practice for Kids Mobile Phone Batteries The fun way to use

The fun way to use them makes children more interested in learning

Supports status tracking: device status timely provided to the EWeLink

writing to-do lists

making it an excellent gift choice for children and friends

OUT1+OUT2: 5V/2

Brain Improvement Device Digital Roller Teaching Stamp Math Practice for Kids Mobile Phone Batteries The fun way to useBrain Improvement Device Digital Roller Teaching Stamp Math Practice for Kids Description: Double headed printed seals, with one chapter for multiplication and one for division, or one for addition and one for subtraction, white ones for multiplication and division, and pink and blue ones for addition and subtraction This is an interesting teaching seal, good looking and practical, anytime, anywhere can give children a problem, so that children better