This is a very useful office and school supplies.The calculator and 6 inch notepad are designed together,which allows you to take notes while calculating,improve study and work efficiency. It's a multi-function scientific calculator,which includes variable statistics, complex number calculations, linear regression, base arithmetic,standard deviation,-rectangular conversions and so on.The"botton lock"function can protect your important notes from deletion by mistake. Foldable design,you can put it in your bag, pocket,or even wallet and carry it to anywhere.It's a partner for for office calculations,construction calculations,financial calculations,home calculations,etc. It has 2-line display shows entry and calculated result at same time,more clarity in calculation results.The pocket calculator adopt high quality silicone button,comfortable and mute, not interfere with other people. The LCD screen is designed without blue light to protect your eyes.when you are not using the calculator,you can also put it on your desk as a notepad.It can be written repeatedly, reducing paper consumption. Colour:black Material:ABS Package Contents: 1 x scientific calculators for students 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.