inland 07443 Blue 4 Buttons 1 x Wheel USB RF Wireless Optical 1600 dpi Mouse Hand Orientation: Both Hands Maximum dpi: 1600 dpi Power Supply: 2 x AAA Batteries Distance: Up to 20' wireless range Operating System Supported: Windows 2000 / XP / VISTA / 7 System Requirement: USB port Package Contents: Wireless optical mouse Nano receiver 2 x AAA batteries User manual