Cute Colorful Calculator-Cute calculator adopts a unique typewriter style shape and cute colors, allowing you to have a pleasant experience when using it, and allowing the calculator to become a scenery on your desk. Dual Power Supply- The mechanical calculator is powered by both solar energy and batteries, and can be used in areas with ample light without batteries. Due to changes in lighting in daily life, it is recommended to use batteries for power supply at the same time. This calculator requires an AAA battery, which is included in package. 12 Digit Large Display Screen-12 digit numerical calculation, sufficient for daily use, and the large display screen makes it easier for you to read.Get back to basics with this simple calculator, perfect for everyday use at home, school or the office. Big Mechanical Buttons-The desktop calculator has environmentally friendly plastic large keys,more suitable for fingers,comfortable touch and fast response.If no operation, it will automatically turn off in 10 minutes.