To maximize the advantages of this mouse and experience maximum comfort, a correct fit is required. Therefore the hand has to be measured. Measure on the inside of the stretched out hand, the distance from your wrist (the cross over between hand and arm) up to the tip of the ring finger. This length provides an indication of the required size. Pointing Device Pointing Device Connectivity Technology: Wireless Movement Detection: BlueTrack Movement Resolution: 1500 dpi Number of Total Buttons: 2 Scroller Type: Scroll Wheel Pointing Device Features: Ergonomic, Contour Ergonomic Fit: Right-handed Only Interfaces/Ports Pointing Device Host Interface: USB Physical Characteristics Color: Black Width: 4.9" Depth: 6.6" Miscellaneous Package Contents: Mouse USB Receiver System Requirements: Operating Systems: Windows 95 Windows 98 Windows 2000 Windows NT Windows XP Windows Vista Windows 7 Mac OS 9 Mac OS X Linux Unix Device Supported: Computer

To maximize the advantages of this mouse and experience maximum comfort, a correct fit is required. Therefore the hand has to be measured. Measure on the inside of the stretched out hand, the distance from your wrist (the cross over between hand and arm) up to the tip of the ring finger. This length provides an indication of the required size. Pointing Device Pointing Device Connectivity Technology: Wireless Movement Detection: BlueTrack Movement Resolution: 1500 dpi Number of Total Buttons:</