Features: A brand-new innovative smart calculator with LCD writing pad, 10-digit display, allows writing while calculating, convenient for recording. Comfortable silicone soft-touch keys, quiet and noiseless, providing a more comfortable touch and silent use experience. Clamshell design makes it easy to carry, ideal for business, work, accounting, student calculations, home use, and more. No dust or ink required, features LCD handwriting; use the erase button to clear the entire screen with one click. Specifications: Product Name: Solar Calculator Board Color: White Material: ABS shell + silicone keys Power supply: Calculator powered by solar energy, tablet powered by button battery Display: HD LCD screen Display size: 64 x 19mm Tablet size: 128 x 62mm Folded size: 161 x 78mm Expanded size: 161 x 156mm Net weight: 128g Package Contents: 1 x Solar Calculator Board Note: The package includes only the items listed above. Other products are not included. Note: Due to lighting reflections and differences in display screens, the color of the item may vary slightly from the images shown. Measurement error is +/- 1-3cm.