SAREPO Wireless Mouse Cordless Mice - Portable Optical 2.4GHz USB Mouse with Switchable DPI Black Enjoy the 2.4 GHz wireless technology, which delivers a reliable connection with up to a 30-feet range, with virtually no interference. 2 DPI resolutions: 800/1600. 1600DPI makes it move more precisely and quickly for your daily work with your computer. The precision of laser for remarkable tracking on virtually any surface (does not work on clear glass or mirrored surfaces) Portable Carry: Lightweight and compact design makes it can be easily carried. Operation systems: Windows 2000, Me, XP, Vista, Win 7 and Mac