FEATURES- 2.4 GHz RF Wireless Mini Keyboard w/Optical Trackball- Black
       Enjoy the freedom of wireless connectivity with Adesso's wireless 
        mini Keyboard with Optical trackball. The keyboard and trackball 
        allow you to work up to 100 feet away from the USB receiver 
        connected to your computer. In addition, the optical trackball 
        provides great accuracy with minimal hand movement due to its 800 
        dpi resolution. The lightweight and stylish keyboard offers 
        mobility and comfort wherever you type. Take complete control of 
        your desktop with hotkeys. The different hotkeys give you quick 
        access to some of your most common tasks such as e-mail access, 
        volume control, and launching your web browser - at the push of a 
        button.
* Streamlined full-featured RF keyboard built-in 27mm Track Ball, with 
  Optical Technology.
* 2.4 GHz radio frequency, 100 feet effective working range, USB port
* 360-degree navigation, sleek and elegant design.
* With notebook keyboard module enables handheld operation and effortless 
  typing.
* 8 different frequencies with 65536 IDs per channel.
     
  -- SPECIFICATIONs -----------------------------------
CONNECTOR    - USB mini receiver
FREQUENCY    - 2.4GHz RF
CHANNELS     - 8 different frequencies with 65,536 IDs per channel.
STANDBY MODE - after 8 minutes
POWER SOURCE - Uses 4-AA Batteries for up to 3 months use
HOT KEYS     - WWW, Pre-Page, Next-Page, Volume-Up, Volume-Down, Mute,
                 E-Mail, Suspend, WWW-Stop, WWW-Refresh, WWW-Search, 
                 My- Favorite.
TRACKBALL    - Resolution: Optical Type, 800 DPI
               Size      : 27 mm
DIMENSIONS   - Keyboard  : 15.1"w x 7"h x 1.9"d
               Receiver  : 3"w x 0.8"h x 0.39"d

2.4GHz RF Wireless USB Mini Keyboard with Optical Trackball and Hot Keys 2.4 GHz with 8 channels provides up to 25 ft of wireless connectivity maybe more Optical trackball is easy to use, two button operation. Relatively small and very lightweight for portability. 800 DPI trackball has high resolution and large enough to be easy to use. Low profile keys for comfortable typing. Windows 2000 and above