Handheld Wired Mice MouseDual and alternative usage way, off-table or placing on the table.It can greatly ease the harm of palm joint or muscle for long time using mouseThumb-controlled trackballConnects via USB PortThis Wired Trackball Mouse's unique shape makes it can be used in two ways: hold in hand or place on desktop. You can adjust your posture freely, even if you are sitting on sofa or lying down, you can also use it conveniently, especially when you are in the narrow space, like in the car, train or in the plane. Plug and play, no software requiredCable Length: Approx. 656 ft / 2mDesktop Resolution: 1200dpiTrackball Resolution: 1600dpiMaterial: ABS Package Content:1 x Wired trackball mouseNote:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.