The Four-Function Small Basic Desk Calculators Are Ideal For, And Large Buttons. Are you tired of counting numbers with your brain? Do you find it inconvenient to calculate with your mobile phone or computer? A basic calculator is one of the necessary tools in people's daily work and life. In order to meet people's needs, it is necessary to choose a powerful calculator. This calculator will satisfy all your calculator needs. ?Two-way Power? - Solar (works only when it is bright) and Battery (included,long battery life.). Automatic shut-down, energy saving and environmental protection. ?Excellent design?This calculator features a unique typewriter style design that mimics the feel of a mechanical keyboard, with fast and accurate key response. The retro round big button keys provide a comfortable touch, making every calculation effortless and enjoyable. ?Large screen display?The calculator features a 12-digit large numeric display that can be placed flat on a desktop, countertop or table for easy use, and the 15-degree tilt screen optimizes the field of view and enhances stability and convenience. ?Versatile Purposes?This calculator is designed for many occasions: business, office, home, basic budgeting, school, and more. Use it to assist your personal finance or just a quick calculation session. ?Functionalities?- Add, subtract, multiply, divide, backspace, grand total, CE, %, M+/M-/MRC. The calculator will turn itself off after about 6 minutes of being idle.