1. DOUBLE POWERED BY SOLAR PANEL AND BUTTON CELL BATTERY The scientific calculator features a builtin replaceable button cell battery and solar power, ensuring you never have to worry about running out of power. 2. SCIENTIFIC CALCULATOR WITH NOTEPAD Combining a calculator and writing board, this device includes a touch pen fixed on the side for easy calculation and notetaking anytime, boosting learning and work efficiency. The writing board has an erase button—simply press it to clear the entire screen and start fresh. 3. PORTABLE DESIGN Compact, this scientific calculator is easy to carry to school, work, or anywhere you need to perform calculations. Made of shatterproof plastic, it offers a comfortable grip, responsive buttons, clear display, and features for longterm use. 4. COMPREHENSIVE FUNCTIONS FOR EXTENSIVE USE Equipped with 417 functions, including basic arithmetic, squares, square roots, exponents, brackets, memory functions, trigonometry, and statistics. The memory function stores up to 5 data entries, minimizing the impact of operational errors.