Water- & shock-resistant calculator is ideal for on-the-go professionals. Sealed rubber keypad & acrylic coated display may be cleaned with soap & water. Soft, contoured keys enable silent data entry. Convenient tax keys are easy to set. Large LCD is easy on the eyes. Power Source(s): Solar; Display Notation: Numeric; Number of Display Digits: 12; Display Characters x Display Lines: 12 x 1.