1、Digital Display: This arithmetic exercise toy adopts skin friendly and durable plastic. Designed with clear digital display. 2、USB C Charge: This arithmetic training machine with 100mAh battery can be used for 30 hours long, supports USB C charge(USB cable not included). 3、Multi Function: This math oral trainer with voice prompt supports addition, subtraction, multiplication and division tests, math games, math formulas, timel imited tests etc. 4、Cartoon Style: This oral arithmetic trainer features cute appearance in cartoon style, which is lovely and eye catching. 5、Perfect Gift: This oral arithmetic trainer contributes to promote logical thinking, perfect gift for kids on Birthday gifts, Halloween, Christmas, Children's day, etc.