Large display: our calculator features a large display screen design, 10-digit large LCD high-definition, clear and easy to read, numbers are clear at a glance Pocket size: the size of the large display calculator is approx. 4.7 x 3.4 inches, small and lightweight for carry and store, which can be easily put in your pocket, supporting indoor and outdoor use Dual power supply: our dual power pocket calculator is designed in dual electric drive, which are powered by light energy and button battery, allowing you to apply in different environments, bring you much convenience Simple to press: large keys with clear numbers or symbols, easy to press and fits for most fingers, high sensitivity and quick button response, making you work more efficiently Reliable material: desktop calculator is made of ABS material, reliable and sturdy, hard to break, and reasonable button layout provides you with a satisfactory experience