Ergonomic Wired Trackball Mouse Optical Handheld Mouse For Win7/ 8/ ME/ XP/ NT PC 4 Adjustable DPI Levels Plug N Play, Black

Features:
Combined with trackball mouse and common mouse, it can be used in the air holding in your hand without desk or on the desk.
With ergonomic design, this professional gaming mouse fits your hand perfectly and relieve your discomfort.
It is convenient for you to use it in the living room lying on the bed or sitting on sofa.
Compatible with most devices with USB port.
High precise optical engine, precise positioning,and effective response.