TWO WAYS TO SUPPLY POWER : This calculator has dual power supply options, solar or backup battery can be selected, it can still work normally even in low light conditions at night, and has a 80mAh AG10 button battery as a backup power supplyLCD DISPLAY : The solar calculator has a tilted LCD screen, ultra-thind elegant, with a reverse design, which makes it easy and accurate to read the screen. The LCD display provides easy-to-read numbers to provide maximum viewing comfortBIG BUTTON DESIGN : The computer button design of the portable calculator, wide keyboard and sensitivity keys are fully ergonomic, giving you a super comfortable experience, very convenient to use, and a very practical office toolWIDELY USED : The 10-digit number of the calculator makes it most suitable for calculations, and it uses durable materials that are not easy to bend or break. It can perform basic mathematics and various financial functions. It is very suitable for offices/homesSATISFACTION GUARANTEE : In order to get the best customer shopping experience, we will provide the best service,,if you are not satisfied with our product for any reason, please contact us first, we will give you a perfect answer