PROFESSIONAL GRADE CALCULATORS. Easily handles 1 and 2 variable statistical calculations three angle modes (degrees radians and grads) and scientific engineering notation modes. BRILLIANT DESIGN. Measure: 5.25 x 3 x 0.5 . Comes with PP slide on cover to protect keyboard and screen from scratching. Reasonable configuration and comfortable. SCIENTIFIC 10+2 DIGITS. HD display. Support natural logarithm trigonometric inverse trigonometric function key. Feature common logarithm / anti-logarithm & hexadecimal number key. LONG LASTING POWER. Powered by battery. Battery included. The calculator will function even in a dim place. The soft rubber button design in line with the use of human habits comfortable for touch. VERSATILE. Performs various science math functions. Perfect for high school and college math. Great for business students use at home office and on the go.