Built-in antimicrobial protection with Microban® inhibits the growth of damaging bacteria.Change calculation feature allows calculator to act like a cash register.Displays large calculations in large size.Prints positive numbers in black and negative numbers in red.Built-in antimicrobial protection with Microban® inhibits the growth of damaging bacteria. Change calculation feature allows calculator to act like a cash register. Displays large calculations in large size. Prints positive numbers in black and negative numbers in red.