Combination of scientific calculator and writeboard, stylus behind the calculator, calculate and record at any time, effectively learning and work efficiency, clear 12-digit display for easy calculation. It contains 240 mathematical calculate functions which covers basic calculate, scientific function calculations, etc. The flip design of the pocket calculator can the mechanical calculator keyboard and whiteboard , easy to carry and quick to pull out when needed for immediate , handy for taking quick notes, calls, and meeting minutes. Easy to operate, suitable for students, office and professionals. he desk calculator is powered by CR2025 battery, it can be replaced at any time. Working time:12-18 months, stand-by time:18-24 months; saving energy and stand-by time, no need worry about low battery . Scientific calculators blue LCD screen to the eyes, The writeboard can also be read clearly in the . Paperless environmental protection, repeatable writing. Double-line display screen design, the first line shows the calculation process, the second line shows the calculation result. Press the clear key to erase the LCD notes and personal privacy. Special one-key lock function can prevent important information from accidentally color:Black Material:plastic Package Contents: 1 x basic calculator Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.