NEWYES Rechargeable Scientific Calculators 991ES MAX, 417 Functions, Writing Pad, Foldable Hard Case, 4-Line Written Display Advanced Calculators for Students School Engineering, Dual Power, Pink

【417 Computing Functions】 Include CALC, SOlVE, Base-N, EQN, MATRIX, MATRIX, TABLE, VECTOR, fractions, variable statistics, complex number calculations, linear regression, base arithmetic, computer science, standard deviation, and polar-rectangular conversions, etc.. 【Rechargeable & Solar Power】The rechargeability battery is built in this scientific calculator. It is also powered by solar energy so you don't need to worry about battery depletion. Charging cable is included. 【Natural Writing Function】 Can input/output the content in writting form and tabular statistics. 【4-Line Display】You can enter 199 characters at a time. Show entry and calculated result in the display screen at same time. Covenient to use. 【Scientific Calculator with Notepad】Come with a 6.5 inch writing tablet and a pen, allowing you to take notes while calculating. Press the delete button to erase the notes, and also can lock it to keep it. (Slide the LOCK KEY)