Product information: KSK-3200RF Wireless or USB Super-Mini Black Keyboard-Far-ranging and reliable radio-frequency transmission at 2.4 GHz up to approx. 10 m (33 ft) away from the PC
-Built-in opto-mechanical trackball with mouse function and two mouse buttons
-Full functionality of a full-size layout keyboard due to built-in numeric keypad and 12 function keys
-Extremely silent stroke and tactile feedback due to high-quality X-Type membrane technology
-Optimal for Digital Living-Rooms (HTPC), mobile use as well as for training, conference & presentation facilities etc.