Language Flashcards, W/Decoder Device, 30 Double-Sided Cards Kids will love the magic decoder as they challenge themselves with interesting language questions. Just slide the question flashcards into the colorful decoder, answer the question, then check the decoder window to see if the answer was correct. Extremely portable and flexible, can be played alone or with others. Includes: unique slider/decoder with dry-erase surface, 30 double-sided flashcards, one Crayola dry-erase marker and eraser cloth.