Product Feature: A new innovative Smart calculator with LCD writing , with 10 digits display, write while calculating, very convenient for recording.Comfortable ,quiet and noise-free. which brings you more comfortable touch and a silent using experience.Clamshell design makes it easy to carry, perfect choice for business at work, accounting calculations, student calculations, home , etcNo dust and ink, LCD handwriting,With an erase button, you can clear the full screen with a click.Parameter:Product Name: Solar Calculator supply mode: the calculator is charged by solar energy, and the is powered by button batteriesDisplay window: HD LCD screenDisplay window size: 64 x 19mmProduct folded size: 161 x 78mmProduct expansion size: 161 x 156mmNet weight: 128GMaterial: ABS shell + silicone keycolour: blackPackage Contents:1 x Solar Calculator Only the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.