This multifunctional calculator set includes four black portable basic desk calculators to cover daily use and backup needs, ideal for students, office workers, housewives, anyone needing daily calculations and quick note-taking. It combines a calculator and notebook, a built-in stylus pen to eliminate the need for paper and boost learning and work efficiency. The devices feature responsive silicone keys that deliver comfortable, durable presses for smooth, quiet input, plus a 12-digit large display with clear, easy-to-read numbers to prevent calculation errors from unclear digits, perfect for all kinds of basic and daily computations. The foldable design makes them highly portable: they fit comfortably in hand or on a desk, can easily slip into a pocket, backpack, pen bag for convenient use at home, in the office, at school.