1. Smart calculator and LCD writing board, 12-digit display, you can calculate while recording. 2. The writing board supports repeated writing, you can write and record information at any time without paper and ink, which is convenient, practical, and environmentally friendly. 3. LCD screen, no blue light, protect eye health. 4. With erase and lock buttons, you can clear the entire screen by clicking the erase button. The lock button prevents the accidental deletion of data. 5. Replaceable batteries, no need to charge and plug in to use. Low consumption and long service life. 6. Small size,canfoldable storage, easy to carry. 7. Wide range of uses, very suitable for children or adults to use in homes, offices, schools and other occasions. Specification: Screen Size: 6 Inch Battery: 2 * 1220 Button Cell(include) Unfold Size: about16 x 156 x 05cm Fold size:about 16 x 78 x 12cm Colour:black Material:ABS Size:160 x 775mm Package Contents: 1 * Foldable Calculator & LCD Writing 1 * Pen 1 * English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.