[Dual Power Design] This desktop calculator utilizes both the powerboard and battery power(battery is not included). The powerboard will power up the calculator thoroughly in a lit environment, it's a simple and worry-free partner. [12-digit Large Display] The LCD screen displayer clearly shows big numbers makes it easy to read from afar, it's layout and aesthetically pleasing. Max support 12 digits display. [Big Buttons] The electronic desk calculator adopts a scientific large button design, which can make you work more quickly, efficiently and conveniently. [Mulit-Function] Add, subtract, multiply, divide, backspace, grand total, CE, %, M+/M-/MRC, ON/AC button, and auto Powr-Off. The desktop calculator will turn itself off after about 6 minutes of being idle. [Specification ] ABS material, size 5.7 x 4.7 x1.8 In, weight 4 Oz. Doesn't take up much desk space, but it's big enough to be comfortable using it, suitable for business, office, home, school.