... .500/1000DPI switch,more precise 4.Receiver hide in mouse,hard to louse 5.Fashion 1.Portable and beautiful Nano receiver2 ... 2.4G HZ frequency ,10m available3.Receiver hide in mouse , hard to lose 4.500DPI/1000DPI switch , more precise5.Human engineering ... ISO9001-2008 Certificate, CE, FCC, MIC, ROHS 2.4G Nano Wireless optical computer Mouse