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 functions<br> Long battery life. In the environment with sufficient , the solar panel is powered by supply with the battery, and the use time is long.<br> 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.<br> 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.<br> 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.<br> Folding : fold in half<br> Battery type: CR2032 coin cell/solar powered<br> Weight: 135g<br> Size: 162x81x17.5mm<br> Basic operations:<br> Degrees, minutes and seconds<br> negative number<br> percentage<br> Decomposition factor<br> nth power<br> Trigonometric functions<br> Inverse trigonometric functions<br> Hyperbolic function<br> Exponential, pair exponential function<br> Reciprocal, factorial<br> Permutations<br> angle unit<br> Coordinate transformation<br> calculus<br> scientific constant<br> Metric conversion<br> Colour:black<br> Material:ABS+Silicone<br> Package Contents:<br> 1 x scientific calculators<br> Only the above package content, other products are not included.<br> 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.