Dual Power Supply: Mini calculator is powered by solar energy and battery, which can switch power freely according to the environment, It can work in a bright place without battery. Basic Calculators:Made with ABS material, office calculator is only 4.7x2.7in and weighs 0.1lb, making it compact and light enough to carry in your pocket., small and portable. Multifunctional Design: 8-Digit LCD Display, features include automatic tax keys, percent key, square root key, backspace key, 3-key memory, and auto shut-off. Widely Used: Pocket calculators are suitable for home, school and office; the best gift for elementary school students. Package Include: 20 packs of pocket size calculators. Great for independent math practice, Students learn addition, subtraction, multiplication, division, and more with these classroom-ready calculators. Basic Calculator, Mini Calculators Pocket Size Basic Calculators, 8 Digit Display Solar Battery Dual Power Function Calculators Bulk for Students Kids School Home Office