Multifunction: The calculator is a combination of basic calculator, writing tablet and pen, allowing you to write while calculating to improve efficiency. The desktop calculator has an erase button, so the efficient reuse to reduce paper consumption and be environmentally friendly.Portable: The handheld calculator is foldable which is easy to carry in your bag, pocket or purse, it can be taken out quickly and used immediately when needed. The calculator can be used at home, in the office and at school, to write with the magnetic pen anytime and anywhere.Mute: The calculator adopts high quality silicone keyboard, which has no keyboard sound to work or study silently, don't worry about disturbing others in office, school and home and enjoy of your quiet moment.