The SL-310UC is a pocket calculator with a 10-digit LCD display, featuring percentage and tax calculations, sign change functionality, and is environmentally friendly with solar power and batteries. It includes a 10-Digit BIG-Display with Function Command Signs, Plastic Keys, Key Rollover, Professional Percentage Calculation, Profit Margin via %-key, Time calculation, TAX Calculation, 4-Key Memory, 3-Digit Comma Markers, Key for Changing Plus/Minus Sign, Backspace Key, and Square Root. The calculator also has a 10-digit LCD display with calculation control display, is solar/battery powered, and measures 0.8 x 7 x 11.7 cm. A protective case is included.