Miniature Wireless USB Keyboard with Touchpad
Add a miniature wireless controller to your computer project with this combination keyboard and touchpad. We found the smallest wireless USB keyboard available, a mere 6" x 2.4" x 0.5" (152mm x 59mm x 12.5mm)!The keyboard itself is battery powered (there's a rechargeable battery inside that you charge up via the included USB cable). The keyboard communicates back to the computer via 2.4 GHz wireless link (not Bluetooth).
The keyboard can only be used with a USB-host such as a computer. Its not intended to be used with an Arduino or Basic Stamp, etc. We tested it with the Raspberry Pi and it works great: uses only one USB port for both mouse and keyboard.
More information: https://www.adafruit.com/products/922