Ideal for professional users, 12-digit desktop calculator is equipped with advanced functions, wide design, durable double-injection keytops and tilt-adjustable LCD. Functions include tax calculation, business calculation, grand total key, sign change, decimal point (+, 4, 3, 2, 0, F), rounding, shift key and backspace key. Calculator also features a protective metal plate. Dual-power calculator automatically powers off after use and runs on solar and battery power.