Built-in antimicrobial protection with Microbanï¿½ inhibits the growth of damaging bacteria. Ideal for heavy-duty office use. Adds the grand total of several calculations, such as the total prices times units on an invoice. Blue fluorescent display shows punctuation. Displays and prints date and time. Power Source(s): AC; Display Notation: Numeric; Number of Display Digits: 12; Display Characters x Display Lines: N/A.