This calculator is combine with LCD writing board. With the stylus pen behind of the writing board, you can calculate and record it . Has 498 computing functionsLong battery life. In the environment with sufficient , the solar panel is powered by 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 -friendly.This handwriting calculators is only 153g, lightweight 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.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 halfBattery type: CR2032 coin cellsolar poweredWeight: 135gSize: 162x81x17.5mmBasic operations:Degrees, minutes and secondsnegative numberpercentageDecomposition factornth powerTrigonometric functionsInverse trigonometric functionsHyperbolic functionExponential, pair exponential functionReciprocal, factorialPermutationsangle unitCoordinate transformationcalculusscientific constantMetric conversionColour:blackMaterial:ABS+SiliconePackage Contents:1 x scientific calculatorsOnly 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.