Nulea M501 Wireless Trackball Mouse, Ergonomic Thumb Control, 4 DPI LevelsThe Nulea M501 is a wireless trackball mouse suited to users who want thumb-driven cursor control in compact workspaces or away from a conventional mouse. Its curved shape positions the palm naturally, while the trackball moves the pointer without repeated arm movement.Four DPI levels let you tailor cursor speed to different tasks. The ball can roll across almost any surface, so the mouse remains usable in tight areas where desk space is limited.The mouse connects to up to three devices through Bluetooth or a 2.4 GHz USB receiver, selected with the button underneath. Six buttons include forward and backward controls. A built-in rechargeable battery uses the included charging cable, and the receiver stores in the mouse base.Itemweight0.55 poundsProductdimensions4.1 x 0.0 x 5.4 inchesMaterialPlastic