The Sharp EL334WB 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).