Features 1、2-in-1 Function: Scientific calculator with 6-inch handwriting board and stylus, you can calculate and take notes at the same time. Ensures dust-free and ink-free writing, do not hurt eyes, write smoothly and reusable. 2、Easy to Operate: Large and soft silicone keys are comfortable to use, Built-in one key lock protection, which can protect your important data and patterns from loss, and one key to clear all when no need anymore. 3、Dual Power Supply: Basic calculator built-in solar panel and 2*button battery, convenient for indoor and outdoor use amd makes long standby to keep longer using time. 4、Lightweight and Foldable: Sturdy ABS shell, ultra-thin rounded body with foldable design. weights only 128g/4.5oz, thickness is 7mm. Easy to put in pocket and any bag. 5、Widely Used: Mulltifunctional calculator with stylus slot and 10-bit display wide screen, easy to store and carry. ideal for home, school, financial, office and industry use. Features: 2-in-1 Function: Scientific calculator with 6-inch handwriting board and stylus, you can calculate and take notes at the same time. Ensures dust-free and ink-free writing, do not hurt eyes, write smoothly and reusable. Easy to Operate: Large and soft silicone keys are comfortable to use, Built-in one key lock protection, which can protect your important data and patterns from loss, and one key to clear all when no need anymore. Dual Power Supply: Basic calculator built-in solar panel and 2*button battery, convenient for indoor and outdoor use amd makes long standby to keep longer using time. Lightweight and Foldable: Sturdy ABS shell, ultra-thin rounded body with foldable design. weights only 128g/4.5oz, thickness is 7mm. Easy to put in pocket and any bag. Widely Used: Mulltifunctional calculator with stylus slot and 10-bit display wide screen, easy to store and carry. ideal for home, school, financial, office and industry use. 240 Calculation Functions: Support statistical calculations, standard deviation, mean, sum of squares, trigonometric functions, hyperbolic functions, square roots, cube roots, inverses, factorials, random numbers, pi, engineering symbols, coordinate transformation, etc. Specifications: Main Material: ABS + Silicone Solar Panel: 1.5V/45mA Battery: 3V/30mA Size: 161*78mm / 6.3 * 3.1in Weight: About 120g/4.2oz Packing List: 1 * Calculator 1 * Manual Package List Packing List: 1 * Calculator 1 * Manual