BALMUDA design - NumberKey - English
http://www.balmuda.com/en/laboratory/numberkey/index.html

"Turns your iPhone/iPod touch into a numeric keypad for your notebook. Wouldn't it be useful if your notebook computer had a numeric keypad? The NumberKey does just that! The NumberKey turns your iPhone/iPod touch into a portable numeric keypad so you can use it at your home, office, and even when you're on-the-go."

"Turns your iPhone/iPod touch into a numeric keypad for your notebook."

turn iphone into a number pad when in use with laptop