Adesso WKB-3150UB 2.4 GHz Wireless Ergo Trackball Keyboard

Wireless Technology, Ergonomic Contour Design, Split Key Design, Integrated Palm Rest, Membrane Switch, Built-in Trackball with Optical Sensor, Built-In Scroll Wheel, Removable Trackball, Auto Sleep and Power On/Off Switch, Nano Receiver, Compact and Portable