EasyLink 2.4Ghz wireless mini keyboard with built-in optical trackball. Superior long-distance connectivity of over 30 feet. 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 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 Different Hotkeys Give You Quick Access To Some Of Your Most Common Tasks Such As E-Mail Access