Bornd 1000/1750 DPI Bluetooth 3.0 Optical Wireless Mouse, Blue (C170B BLUE) Buttons: 3 (left, right, scroll) Operation Range: 30-Feet, 360 degrees Resolutions: 1000 / 2000 DPI Operating Voltage: 1.5V Operating Current: 15mA Compatible With: Windows 98SE/ 2000/ XP/ ME/ Vista/ 7/ Mac OS 1x AA Alkaline Battery (Not Included)