Handheld Wired Mice Mouse Dual 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 mouse Thumb-controlled trackball Connects via USB Port This Wired Trackball Mouse's 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 required Cable Length: . 6.56 ft / 2m Desktop Resolution: 1200dpi Trackball Resolution: 1600dpi Material: ABS Package Content:1 x Wired trackball mouse Note: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.