Insert the card into the educational flashcards, a key feature, you can read and learn over and over again, without having to reinsert the card. 3.5 x 4.2 inches - perfect handheld size, toddlers can also use them independently. This educational toy comes with a built-in rechargeable battery that lasts for 6-8 hours and only takes 2.5 hours to fully charge, eliminating the need for frequent charging. The card reader weighs 78 grams and measures 4.5 * 3.3 * 0.5 inches with die-cut rounded corners and a waterproof coating, making it safe for children. The small learning card contains 112 cards - 224 pages, an ideal learning resource to help children learn the alphabet, colors, shapes, and identify objects on the cards. The perfect educational toy for children under 9 years old to learn new words, practice listening comprehension, expand vocabulary, and improve their cognitive abilities. The learning flashcard allows children to put down their mobile phones and iPads. The screen-free design reduces the time toddlers spend touching the screen and takes care of toddlers' eyesight. Perfect alternative for teaching materials/classroom games/preschool/kindergarten class, homeschooling. Baby flashcards support USB charging, automatic shutdown, adjustable volume. A fun way for children to learn letters and shapes. Great educational toys for toddlers.