About this item Essential Tools for Calculation: the package contains 8 packs of calculators with large buttons in 2 different colors, 4 each in black and silver; With big and sensitive keys, they fit well for simple calculations, essential tools for office, primary school, market or home Dual Power Calculator: the construction calculator can work on solar power (only under bright light) and y power (AA ies are not included); If the solar strip is ed, the numbers in the display will disappear; Please put the y in the calculator compartment before use 12 Digits Calculator: designed with a 12 digits display and large numbers, this colored desk calculator is easy to read, and most useful for large calculations; It is suitable for businessmen, workers, teachers, students or anybody that needs to make any sort of calculation from time to time Big and Comfortable Button: the large calculator machine utilizes a scientific giant button design, which conforms to using habits and is comfortable to touch, helping you rapidly identify numbers and operation characters Multipurpose: this desktop display calculator is about 150 x 120 mm/ 5.91 x 4.72 inches, compact size is easy to carry and store; big calculator is designed for many occasions, like business, office, home, basic budgeting, school, and more, to ist your personal finance or just make a quick calculation session