The Casio HL-820 has an extra large and clear 8 digit LCD display with a built in fold over protection case. The calculator is also battery powered. It has currency conversions back to national currency. Functions include currency conversions and profit margin calculations. Additional features include soft touch rubber keys, command signs, 3 digit comma markers, 4 constants and auto power off. Pocket calculator with protective cover Battery power (1xLR54) Extra large 8 digit LCD display Auto power off Currency Conversion, Profit Margin % Function Command Signs, Double Size + Key 3 Key Memory, 3 digit comma marker, 4 Constants (k) Memory Stored after switch off Display Size (WxD): 40x20mm Dimensions (WxLxH): 63x104x10mm