Features: A brand-new innovative smart calculator with LCD writing pad, 10-digit display, writing while calculating, convenient for recording. Comfortable silicone soft-touch keys, quiet and noiseless. Bring you a more comfortable touch and silent use experience. The clamshell design makes it easy to carry, perfect for business such as work, accounting calculations, student calculations, home use, and more. No dust and ink, LCD handwriting, use the erase button, just click to clear the entire screen. parameter: Product Name: Solar Calculator Board color: White Material: ABS shell + silicone key Power supply mode: the calculator is by solar energy, and the is powered by a button battery Display window: HD LCD screen Display window size: 64 x 19mm 6-inch size: 128 x 62mm Product folded size: 161 x 78mm Product expansion size: 161 x 156mm Net weight: 128G Package Contents: 1 x Solar Calculator Board 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.