The Little Professor was first released by Texas Instruments on 1976. The Little Professor is a backwards-functioning calculator designed for children ages 5 to 9. Instead of providing the answer to a mathematical expression entered by the user, it generates unsolved expressions and prompts the user for the answer. It runs on a 9V battery and this one is in very good working condition. Box shows normal signs of wear. The game includes 13 small cards and 4 large ones. See pictures that are part of the description. Photos are part of the description Make up your own mind based on the images. Careful and tracked shipping by post or relay point Weight of the package with packaging: 1 kilo