Mini Desktop Calculator features an antimicrobial agent that reduces the growth of microbes and bacteria that may cause odors or discoloration. Large angled, 10-digit display that is easy to read. Automatic Tax Keys calculate the tax amount to be added or subtracted to the original price. Other functions include cost/sell/margin keys, percent key, square root, change sign, and three-key independent memory. Dual-powered calculator runs on solar power with battery backup. AG13 battery is included and replaceable. Eco-friendly calculator is manufactured with post-industrial recycled plastic.