The EL-330WB 10 digit professional desktop calculator is perfect for business professionals at home or in the office. The EL-330WB is finished in a modern white design and features a large angled LCD display and durable plastic keys. Cost/sell/margin keys make for quick and easy profit margin calculations (simply enter two variables and the third automatically appears).Other functions include: currency conversion functions, automatic tax keys, percent key, backspace key, 4 key independent memory, extra-large plus key, sign change, and automatic power down. Operates on twin power (solar/battery backup). • Modern white design features a large angled LCD display • Cost/sell/margin keys make for quick and easy profit margin calculations • Currency conversion functions • Backspace key • 4 key memory • Automatic power down