Lei Rui 2.4G Wireless Optical Mouse with DPI Switch (BLUE) Lei Rui Receiver : Small enough to plug in once and leave connected. Wireless : Plug in nano receiver and go wireless. 2.4GHz reliability and performance. Compatible with USB 2.0 or 1.1,Working range within 10 meters (30 Feet) Lei Rui Slot : Convenient nano receiver storage for when you need it.Comfort Grip : Smooth, rubberized grip designed for comfort and control. Compatible with Windows 98SE, ME, 2000, XP, Vista, Windows 7