With a large and clear 2 line display, the Aurora HC102 can show calculation and answer at the same time. This makes it great for Key Stage 1 and 2 education, particularly for teaching BODMAS logic and the use of brackets. This product is also dual powered from both solar power and an LR44 battery, and benefits from an auto power off function that helps to conserve battery life. This product includes a slide-on protective case.