【Function Calculator Tablet】Calculator features 240 arithmetic functions and clear 12-digit display , which is more than the common scientific calculator on the market. And this can meet almost all of your daily computing needs. 【Scientific Calculator with Notepad】This scientific calculator for students intergrates calculation and notebook with a stylus pen. The lcd writing tablet enables you to take notes during the calculation, which do great help for study and work. Great portable high school supplies. Note:Only Unlock the LOCK KEY will the writing area and the erase button work. 【Health environmental protection】 The blue matt LCD screen is used to protect the eyes. When you are not using a calculator, you can also put it on the table as a notepad. It can write repeatedly, reduce paper consumption, environmental protection, no dust and ink, press a clear button to erase LCD notes and protect personal privacy. 【Double- display Screen Design】The first shows the calculation process, the second shows the calculation . Press the clear key to erase the LCD notes and personal privacy. one-key function can prevent important information from accidentally.  Specifications: Color: Black / White/Blue (Optional) Materail: ABS Arithmetic Function: 240 Kinds Display: 12-Digit  Power Supply: CR2025 Battery (Included) Working Time:12-18 Months  Stand-by Time:18-24 Months Package Size: 175*114*20mm/6.89*4.49*0.08in Package Weight: 152g /5.36oz Package Listing: 1 * Calculator 1 * User Manual