Product Specification Information: Screen Material: HD LCD screen Battery: Button cell Product Size: 162x82.2x18.3mm Net Weight Product: 128g Material: ABS colour: black Package Contents: 1 x Calculator Notepad 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. One-click Erase: This calculator notepad equipped with a hidden pen,you can record at any time.And the writingbaord can also be cleared with one click,it can effectively save the paper. Learning Tool: It can effectively help students complete their math homework. : Scientific calculator can be a delicate and decent gift,to your friends, families and colleagues. Feature: It is a cool calculator with writing board and pen.Compared with the traditional basic calculator,this desktop calculator is not only fashionable in appearance,but also easy to record. Folding design easy to carry, this pocket calculator is perfect choice for office,school,home use and so on. Extra-large 12 digit LCD display, tax calculation can be quick and easy.Press the clear button to erase the notes and protect personal privacy.