Note:1. Please note that this mouse requires 2 * AAA batteries, which is NOT included in the package.2. Please allow slight error due to manual measurement. Thanks for your kind understanding.Features:Up to 10m wireless transmission - Stable and smooth transmission. 2.4G wireless connection for easy operation. High precision optical mouse - Positioning accuracy of up to 1600 DPI, to meet the daily office needs and gaming entertainment. The bottom of the mouse is equipped with a receiver storage compartment to store the pouched USB receiver. Wide compatibility - For Windows XP / Vista / Windows 7 / ME / 2000 / Mac OS, or later. Specification:Type: Wireless MousePower: 2 * AAA batteries (NOT included)Switching life: 5 million cyclesHigh resolution: 1600DPIButton: 3 buttons with scroll wheelWireless carrier frequency: 2402MHz-2480MHzMaximum acceleration: 14 inches per secondWireless: 2.4GHz wireless transmissionWorking distance: Up to 10 metersCompatible system: For Windows XP / Vista / Windows 7 / ME / 2000 / Mac OS, or laterWeight: Approx. 59gSize: Approx. 10 * 5.5 * 3.5cm / 3.9 * 2.2 * 1.4inPackage list:1 * Wireless Mouse1 * USB Receiver.