SANWA GMATB39 Wired Ergonomic Trackball Mouse 40mm 600/800/1200/1600 DPIA wired ergonomic trackball mouse featuring a 40mm optical ball for cursor control. The 19-degree tilt angle positions your hand naturally, reducing wrist strain and muscle fatigue during extended computer use. Thumb-controlled trackball movement keeps your wrist and hand in one position, minimizing overall arm movement. Features four adjustable DPI settings (600, 800, 1200, 1600) to customize cursor speed for different tasks.Itemweight0.60 poundsProductdimensions4.3 x 1.9 x 6.1