Portable desktop calculator features a 12-digit, easy-to-read LCD screen with punctuation as well as a metal cover and kick stand. Keyboard is low-noise. Functions include cost/sell/margin, answer check function, 5/4 down rounding, four-key memory, change sign, grand total, right shift, square root and variable decimal. Four-key memory includes memory plus, memory minus, recall memory, and clear memory keys. Twin-power operation automatically switches the calculator from solar to battery power in low light.