Casio 8-Digit Folding Solar Calculator Large Display Portable Handy The SL-100L 8-digit display solar calculator is easy to read with its large display. Its folding case makes this basic calculator perfect to use at home or away. This calculator is available with a dual case feature which ensures protection for the keys. The battery on this folding case solar calculator charges the unit with light from its surroundings. This calculator comes with percent, square root and change sign functions. Use it for schoolwork, accounting, paying bills and other tasks. Folding case solar calculator has an 8-character display Functions: Independent memory, percent, square root, change sign (+/-), constants for +, -, x, / Large easy to read big display and folding case make this basic calculator perfect to use at home or away Power source: Solar plus with battery backup