Advanced 4-line scientific calculator with WriteView display, allows calculations to be entered & displayed as written on paper. Ideal for students studying general math & science, pre-algebra, algebra I & II, geometry, precalculus, calculus, trigonometry, statistics, biology, chemistry, & physics. This calculator performs 640 advanced scientific, math, & statistics functions. Includes a protective hard case & operates on twin-power (solar with battery backup). Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 16; Display Characters x Display Lines: 16 x 4.