Adesso Tru-Form Media 3150 - 2.4 GHz Wireless Ergo Trackball Keyboard - Wireless Connectivity - RF - 30 ft - 2.40 GHz - USB 2.0 Interface - 87 Key On/Off Switch, Connect, Play/Pause, Stop, Previous Tr... - WKB-3150UB

2.4 GHz RF wireless technology - With 2.4 GHz RF wireless technology and 65000 IDs on 12 channels you can enjoy 30 feet of wireless freedom.
Ergonomic Contour Design - Minimizes forearm muscles from twisting and pains from Carpal Tunnel Syndrome.
Split Key Design - Encourages natural position of hands, wrists and forearms for maximum comfort.
Integrated Palm Rest - Keeps your wrists in the most comfortable position.
Membrane Switch - 5 Million keystroke lifecycle for a quiet and fast typing experience.
Built-in Trackball with Optical Sensor - Tracks accurately and precisely with less muscle movement for maximum comfort.
Built-In Scroll Wheel - Provides convenience for office applications or web browsing.
Removable Trackball - Allows for easy cleaning.
Auto Sleep and Power On/Off Switch - Maximizes your battery life up to 6 months.
Compact and Portable - Ultimate space saver and easy-to-carry on the go.