Sharp 12-digit calculator, el339hb, dual power, 4-key memory, 4-1/3″ x 7″ x 3/4″ desktop calculator offers extra-large, 12-digit, liquid crystal display (lcd) with punctuation. Functions include four-key memory (memory plus, memory minus, recall memory and clear memory keys), grand key total, cost/sell/margin, percent and sign change keys, and answer check. Design features a low-noise keyboard, metal case and kick stand. Portable calculator runs on solar power with battery backup. functions four-key memory cost/sell/margin keys percent key grand total key sign change keys answer check includes 12 digit desktop handheld calculator metal case additional information viewing angle: kick-stand 4-key memory: memory plus memory minus recall memory clear memory this product arrives to most customers in 2-3 business days.