Basic Calculators for students - The pocket size calculators are great for back to school.Our calculator has an ergonomic shape with easy-grip contours that fit comfortably in students’ hands Dual Powered Calculator: Solar power (works only when it is in bright light) and battery power (1 AA battery for each calculator). If the solar strip is blocked, the numbers in the display will disappear. Please put the battery in the calculator compartment before use Mini Calculator – Size 4.5 x 2.5 x 0.79 Inch. These are small calculators ,perfect for small fingers to get a feel of concept for calculator and satisfied their minimal Mathematical needs. Adults will have to be careful when pressing the keys, might be a bit tight Basic Calculator - Our hand held calculators adopt 8 digit LCD display with memory function, and are equipped with reasonable multi function designs, such as addition, subtraction, multiplication, division, sum, percentage, square root key and so on; So it can meet student daily needs Our product and service - Each product had been tested before shipment. If you have any question about our product,feel free to contact us via Amazon.com