[911ES Multifunctional Scientific Calculator] - ROATEE business calculator features 417 computing functions, 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.[Dual Power Solar Panel & Coin Battery] - The replaceble coin battery is built in this scientific calculator. It is also powered by solar energy so you don't need to worry about battery depletion.[Anti-Drop Body with High Durability] - The body of this scientific calculator undergoes rigorous quality tests. Due to the design of anti-drop body, no need to worry about the damage by accidentally falling.[Lightweight and Portable Design] - This lightweight scientific calculator only weighs 5 ounces. It can be easily put in your pocket, which is convenient for business and college.[Conversion of Fraction and Decimal] - You can change the results through the key 'S⇔D'; Or you can configure calculator setting: 1. Press the button 'SHIFT'. 2. Press the button 'MODE'. 3. Choose 1 or 2 to set the mode of fraction or decimal. 【MthIO for fraction, LineIO for decimal】