With the Logitech M570 Wireless Trackball, you can move the cursorwithout moving your hand. Its sculptured shape offers complete comforteven after working for many hours. This wireless trackball mouseuses the Logitech Advanced 2.4 GHz wireless technology to let youcontrol your PC or laptop within a range of 30 feet. You can leavethe tiny unifying nano receiver plugged into your device. The receiverallows you to connect up to six compatible wireless devices withoutthe need for many USB ports. It can also be tucked behind the trackballmouse near the battery while travelling. Back/forward and programmablebuttons make navigation a breeze. This Logitech trackball mouse worksefficiently on a single battery for up to 18 months.