Insert the card into the educational flashcards, a key feature, you can read and learn again and again, without having to reinsert the card. 3.5 x 4.2 inch handheld size, toddlers can also use them independently. This toy has 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 includes 112 cards - 224 pages, an ideal learning resource to help children learn the alphabet, colors, shapes, and identify objects on the cards. The perfect toy for children under 9 years old to learn new words, practice listening, expand vocabulary, and improve their cognitive abilities. The learning flashcard allows children to put down their mobile phones and I-pads. The screen-free design reduces the time toddlers touch the screen and takes care of toddlers' eyesight. Perfect alternative for teaching aids/classroom games/preschool/kindergarten class, homeschooling. Baby flashcards support USB charging, automatic shutdown, adjustable volume. A fun way for children to learn their letters and shapes. Great toys for toddlers.