CPAs and others who are constantly fighting with numbers will appreciate this Mouse Pad that also works as a 10-digit calculator that includes M+, M-, MRC calculation and has an on/off switch when only the pad is needed. It will light up in the wee small hours of the morning and can be used as a USB 1.1 port hub. The device will work by LR44 battery (included) or 5V adapter (not included) and has a price of $17.99.