2.4Ghz wireless mouse with optical technology nano receiver hidden in the battery slot. Three adjustable dpi: 800/1000/1200 built-in energy saving system. Elegant and ergonomic design scrolls easily in every direction comfortable in using. Compatible with windows and mac os system. Product specifications: RF carrier: 2402mhz-2480mhz. Rf operation channel: 16,aufo frequency hopping. Rated operation current: 15MA/ 3V. Connection: wireless 2.4G. Powered by: 1 x AA battery (not included).