Rosewill 4 Buttons, Wheel USB Wired Optical Mouse, for Both Hands, up to 2000DPI (RM-D2U) Plug & Play Interface: USB Hand Orientation: Both Hands Tracking Method: Optical Buttons: 4 Scrolling Capability: 1 x Wheel Maximum DPI: 2000 DPI Adjustable DPI 800/1200/2000DPI