USB numpads are nothing new, but IDEA Japan’s 10 Key also functions as a calculator, so it’s… lemme calculate that… yep, twice as useful.
Those who want their peripherals to blend in with the rest of their computer will be glad to know that the 10 Key also comes in black and white.
I don’t know if there’s any way to re-map the arrow keys though, and that could be a problem if you’re used to the 2-4-6-8 layout of ordinary numpads. Unless of course that functionality is baked into you operating system and not in the peripheral itself.
You can get the 10 Key at Retail Factory for £50 (approx. $80 USD). I guess the dual functionality and the design were factored into the formula used to derive the price.