This calculator is combine with LCD writing board. With the stylus pen behind of the writing board, you can calculate and record it very easily. Has 498 computing functions Long battery life. In the environment with sufficient , the solar panel is powered by dual power supply with the battery, and the use time is long. With this 2-in1 Scientific Calculator, you can calculate and record at any time, you also can put it as a notepad when you are not using the calculator. The calculators has a button, you can click this erase button to clear the full screen, write repeatedly, reducing paper consumption and being eco-friendly. This handwriting calculators is only 153g, and clamshell design, easy to carry. Product size: 162x81x17.5mm. You can take it in your bag, pocket, or even purse, the perfect for office business, classroom, and home use. Our calculator's keyboard' re made of silicone material, keys, quiet and noise-free. With this calculator, you will not interfere with other people while calculating the data, perfect for working and learning. Folding : fold in half Battery type: CR2032 coin cell/solar powered Weight: 135g Size: 162x81x17.5mm Basic operations: Degrees, minutes and seconds negative number percentage Decomposition factor nth power root Trigonometric functions Inverse trigonometric functions Hyperbolic function Exponential, pair exponential function Reciprocal, factorial Permutations angle unit Coordinate transformation calculus scientific constant Metric conversion Colour:black Material:ABS+Silicone Package Contents: 1 x scientific calculators 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.