Product Specification Information: Screen Material: HD LCD screen Battery: Button cell Product Size: 162x82.2x18.3mm Net Weight Product: 128g Material: ABS colour: blue 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. 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. 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. 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.