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Calculator and Notepad: A single device that serves as both a writing tablet and a calculator. The built-in stylus pen is great for taking notes while you're doing calculations. For a smooth test and long battery life, use dual power—a solar panel and a changeable button battery. Smooth Press & Pleasant Touch: The soft silicone button has a smooth press and a comfortable touch. enduring in usage Others are not disturbed by the mute button.