A4Tech G6-19. Device interface: RF Wireless, Movement detection technology: Optical, Movement resolution: 1000 DPI. Frequency range: 2.4 GHz, Wireless range: 10 m. Battery technology: Alkaline, Battery type: AAA. Compatibility: IBM/PC, Compatible operating systems: Windows 2000, XP, MCE 2005, XP(x64), 2003(x64), Vista, Minimum system requirements: USB Port