- A powerful calculator with business ingenuity. *With the HP 10bII you can handle any calculation, whether it is calculations for courses and small business transactions or financial calculations. *The HP 10bII's more than 100 time-saving, accessible business features help you work faster and more efficiently. *Thanks to the ease of use (the calculator works with algebraic notation) you can get started quickly. *Thanks to the large number of useful functions and the attractive price, the HP 10bII is a good investment. *Power supply: two button cell batteries (DL2032).