Product Feature: A new innovative Smart calculator with LCD writing tablet, with 10 digits display, write while calculating, convenient for recording. Comfortable keys,quiet and noise-free. which brings you more comfortable touch and a silent using experience. Clamshell design makes it easy to carry, perfect for business at work, accounting calculations, student calculations, home use, etc No dust and ink, LCD handwriting,With an erase button, you can clear the full screen with a click. Parameter: Product Name: Solar Calculator Tablet Power supply mode: the calculator is by solar energy, and the tablet is powered by button batteries Display window: HD LCD screen Display window size: 64 x 19mm Product folded size: 161 x 78mm Product expansion size: 161 x 156mm Net weight: 128G Material: ABS shell + silicone key colour: black Package Contents: 1 x Solar Calculator Tablet Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.