You will receive a set of 24 black basic student calculators, easy to carry and suitable for office, school or home use. These calculators have an 8-digit display and a range of useful features including automatic tax calculations, percentage keys, a backspace key, 3-key memory, a square root key and an auto-off function. They feature a dual power system, using both solar energy and battery backup, batteries not included. They work without batteries in well-lit environments, you can insert an Aa battery for use in early mornings or dimly lit spaces. The compact, sensitive calculators respond quickly to key presses to help boost efficiency in any task, making them great for independent math practice to help students master addition, subtraction, multiplication and division, ideal for classroom use to help children build essential math skills.