Evoluent4 Small Wireless ergonomic vertical mouse BNEEVR4SW The Evoluent 4 vertical mouse ensures an ergonomically responsible hand position. Features:Ergonomic: supports your hand in a fully upright neutral handshake position that eliminates forearm twisting Small version: for hands less than about 7 inches or 178mm long from the tip of the middle finger to the wrist crease Unique: short habituation time Version 4 improved shape: better thumb and finger support Version 4 convenient adjustment: of pointer speed Specifications:Number of buttons: 6 Resolution (cursor speed): 800/1300/1800/2600 dpi Plug & play: Yes Cable length: - Rechargeable: No Operating system: WinXP, Vista, Win7, Win8, OS X 10.5 < Width: 105 mm Height: 71 mm Depth: 81 mm Type: Vertical Hand: Righthanded Connection: Wireless