Resolution: desktop 1600DPI, track 1000DPI Wireless handheld / desktop -purpose track, ergonomic design, feel comfortable, trackball and normal design as one can hold in the 1 x USB Receiver Product size: 10.5cm * 6.5cm * 5cm; 1 x track (with retail package) of your hand rolling a trackball to move the cursor and such as the use of normal placed on a table, two use intelligent recognition and automatic 2.4GHz interference design use of ordinary , convenient text input. Rechargeable lithium battery Color: Black Compatible with all of the operating system windows and , Unix, Mac systems, etc. and the function key is shared. The effective distance of 10 and high quality USB interface, plug and play Can not be used to support the use of the desktop, easy to adjust the use of computer posture, reduce the of the wrist and spine, as well as the Quantity:1pcs The Effective Distance Of 10 1 X Track (with Retail Package) Product Size: 10.5cm * 6.5cm * 5cm; Compatible With All Of The Operating System Windows And , Unix, Mac Systems, Etc. Of Your Hand Rolling A Trackball To Move The Cursor And Such As The Use Of Normal Placed On A Table, Two Use Intelligent Recognition And Automatic