Large, color-coded keyboard. 144 built-in mathematic functions including fraction functions. Floating negative sign appears to the left of the number displayed. Accurate 10 digit, 10 + 2 display. Backspace key to fix entry mistakes. Basic Scientific, Exponential and Trigonometric functions. Single variable statistical calculation. Order of operations MDAS. Polar-rectangular conversions. DMS<>DD,P<>R Mean, Standard, Deviation. Super Solar - no more battery costs. Slide on hard case.