12 digit professional large desktop calculator with kick stand display is perfect for business professionals at home or in the office. The EL-334WB is finished in a modern white design and features a large LCD display and large 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: grand total key, double zero key, backspace key, automatic tax keys, percent key, 4 key independent memory, extra-large plus key, sign change, and automatic power down. Operates on twin power (solar/battery backup).