No Batteries Needed: Solar-powered, with an option to use 1 x AA battery for sound effects. The solar panel operates the real-life calculator function. Interactive Learning: Real working calculator with large buttons, bills, coins, bank card, and educational booklet included, perfect for learning math skills while having fun. Complete Set: 67 pieces, including 25 pretend play money bills and 40 fake coins for realistic play. The bills and coins are life-size so kids can learn to count and make change. Built-In Write and Wipe Board: Includes a dry-erase marker, great for taking notes or writing numbers. Gift Ready: Packaged in a colorful box, ideal for birthdays, Christmas, or holiday gifts. Gift the gift of imaginative play. Ideal for toddlers and kids 3 years and up.