This optical mouse has a DPI sensitivity switching function. Unique shape, with natural curves that support your hand you can play comfortably and maneuver effortlessly for as long as you want, incredibly handy feature for day-to-day mousing. Powerful the mainstream optical engine support, quality and stability. Description: wireless optical mouse digital wireless transmission to provide furthest reach 10 meters from the operation Built-in mouse memory, no recding is needing after battery replaced 16 automatically switchabel working frequency Shortcut button can be used to browse the internet or applications, easily on the toolbar "forward" and "backward" function Power switch, in case of not using power off completely Rated working Voltage: 1.5V / 3.0V Rated working Current: 7.5-14mA Power Supply: 2 x AAA Battery (not included) Max. Acceleration: 28ft/Sec Compatible with Windows 2000/XP/Vista/Linux/Win 7/MAC operation system USB: ver 1.1/2.0 Working range: Up to 10 meters Built -in USB nano receiver Plug and Play, no need to install extra drivers Resolution: 1000dpi, 1200dpi, 1600dpi adjustable Ergonomics: Support,  comfortable grip Color: Blue Material: ABS Size: Approx. 70 x 30mm/ 2.76 x 1.97 x 1.18inch Cautions: Operation distance is closely related to the enviroment.   Battery life may be different for personal habit of using mouse.   In case of mouse failure, please check battery power and replace it as necessary. The mouse will shut off automatically and enter sleeping mode for saving power when it is not used for a long time. To wake it up, press the right or left button.   Package Includes: 1 x Wireless Mouse Note: Need plug the included USB receiver when you use the mouse.