Large 12-digit Display:The huge large LCD screen that clearly displays big numbers makes it easy to read from afar, and its aesthetically pleasing. Max support 12 digits display. Dual power Design:The calculator utilizes both the solar power and battery power (battery not included). As long as you use it in a well-lit environment,the solar panel will provide continuous power to the calculator. Sensitive and Big Buttons:Once pressed, the buttons quickly register and display the corresponding number on the screen. The electronic desk calculator adopts a scientific large button design, which conforms to human habits and is comfortable to touch. 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. Best for Home & Office] This basic calculator suitable for business, office, home, school or anybody that needs make any sort of calculation from time to time.