Robust, professional grade scientific calculator (2x L1154F battery included with 2-year usage).2-line display: show entry and calculated result at thesame time.Easily handles 1 and 2 variable statistical calculations, three angle modes (degrees, radians, and grads), and scientific/engineeringnotation modes.Slide-off protective hard case.Ideal for high school students, college students and professionals. Life-time warranty from Helect.