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 cell/solar poweredWeight: 135gSize: 162x81x17.5mmBasic operations:Degrees, minutes and secondsnegative numberpercentageDecomposition factornth power Trigonometric 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.