Microsoft Arc Touch Mouse RVF-00001 Black 2 Buttons Touch Scroll USB RF Wireless BlueTrack 1000 dpi Mouse Hand Orientation: Both Hands Maximum dpi: 1000 dpi Power Supply: 2 x AAA Batteries Operating System Supported: Windows 7, Windows Vista, Windows XP (excluding Windows XP 64-bit) System Requirement: USB port Parts: 3 years limited Labor: 3 years limited