12 DIGITS LARGE DISPLAY:12 digits calculators are quite useful for most calculation problems in life and work. Large display with a tilted angle of 30, you can read screen clearly from any angle. DUAL POWER: One AA battery and solar panel helps make sure that the calculator will function even in a dim place.Auto power off (10 minutes don't use). BIG BUTTON DESIGN: Made of new durable plastic material, the calculators adopt ergonomic button design in line with the use of human habits and comfortable for touch. ANTI-SKID DESIGN AT THE BOTTOM: with anti-skid pads, it is not easy to slide during operation. It is very suitable for homes and offices, performs common mathematical operations and various financial functions.