2.4GHz wired USB handheld mouse finger using optical track ball Feature: Quantity:1pcs Color: Black About hand general track ball mouse, ergonomic design, comfortable, without support for desktop, right hand general, make you in the in front of the computer in the sitting position can be adjusted, sitting on the couch or lying in bed, and outdoors can be convenient to use. USB interface, plug and play Compatible with all of the operating system windows and, Unix, systems, etc. Resolution: 1000DPI The length of 2 meters Product size: 11cm * 6cm * 5cm; Package includes: 1 x track ball mouse(with retail package) 1 x USB receiver