Easy-to-use Design With a large screen this calculator is made for convenient comfortable everyday use. Its tough titled display can even increases visibility from any angle. Large Applied Button Comfortable and durable buttons make use easy for people of any age including children. Robust Build With a hard plastic body the Office Calculator is built with everyday use in mind. Its 6x4 size ensure comfort with use. Standard Functions With 6 functions including addition, subtraction, fractions, percentages and tax conversions this calculator is able to perform efficiently for everyone. Dual-power source with use of battery and solar power it supports constant use throughout your day everyday. Ergonomic Design Large and clear display makes it easier to see. 30 tilt design is more convenient for people to see. PC Touch Keys with Ergonomic design, wide keyboard with big button feel super comfortable and increased pressure sensitivity. Multiple Use Keys simplifies financial calculations to save time and increases efficiency. Big Button Keys Comfortable Computer Buttons: The special computer key is higher than the common calculator and it increases the resiliency of this button. The big figure button cannot be stuck easily during you use it. And it can help the aged seeing clearly and using it happily.