➤ PROFESSIONAL GRADE CALCULATORS. Measure: 5.9" x 3.1" x 0.5". 240 scientific functions calculator, meet your most calculation requirements for maths, algebra, fractions, statistics, accounting etc. ➤ BRILLIANT DESIGN. 12+10 digits, 2-line display, makes it possible to view both the calculation formula and its result at the same time. For high school and college students use at home, and on the go. ➤ FUNCTIONALITY. Error location and replay key, allow you to backtrack step-by-step through calculations without having to restart the entire process. ➤ DUAL POWER. Solar power with battery backup (battery included), helps make sure that the calculator will function even in a dim place. PP slide on cover to protect keyboard and screen from scratching. ➤ SIMPLE & STURDY. Durable ABS plastic case & soft rubber button design in line with the use of human habits, comfortable for touch. Reasonable configuration and comfortable.