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calculator: This calculator for students intergrates calculation and LCD notebook with a stylus pen. You can take notes while calculating without paper, which improves learning and work efficiency, saves your time and is more convenient √ Large display:The calculator with large LCD screen and 10-digit display. And the big display of the LCD writing board provides a better visual experience, offering ideal visibility while being very practical √ Dual Power: Notebook calculator supports battery and solar power. The replaceble battery is built in this calculator. The calculator and LCD screen both have built-in batteries. If you encounter a problem with the calculator or LCD screen not working, it may be because the battery on one side is dead. You can contact us for a free replacement or a full refund √ High Quality Materials: This calculator is made from high quality plastic,slim and light. The folded design is easy to carry. Then you can put it anywhere such as schoolbags, briefcases, pockets, etc.This practical multifunctional scientific calculator is suitable for use in secondary schools, universities, primary schools, engineering schools, accounting offices and other study or office premises