Whether you're a student or professional, the 10bii+ makes it easy to solve business, financial, statistical and math calculations. Over 100 built-in functions including probability distributions. Intuitive keyboard layout with minimal keystrokes required formon functions. Easy-to-read display with adjustable contrast and on-screen labels. Permitted for use on sat, psat/nmsqt and college board ap tests. Power source(s): battery; display notation: numeric; number of display digits: 12; display characters x display lines: 12 x 1.