Evoluent Vertical Mouse 4 right, small Vertical mouse for ergonomic comfort - Suitable for a hand length of under 178 mm, measured from the wrist to the tip of the middle finger - Promotes a neutral wrist and forearm posture - Fast and accurate cursor control - Minimal learning curve - 4 x Selectable speeds (800, 1300, 1800, 2600 dpi) System requirements: Windows 7, 8, 10, OS X 10.5 A mouse pad is recommended when using a vertical mouse. BakkerElkhuizen guarantees the longevity of its products. Register your product before the basic warranty expires on the manufacturer's website using the registration code or the EAN number on your product for an extended warranty of up to 5 years on electronics or even longer warranties on non-electronic products! * Extended warranties apply to all non-electronic products with the exception of all gas spring parts, which are covered by a 5-year manufacturer warranty.