Vertical mouse: prevents RSIThe HE Mouse has a vertical grip which provides a neutral, relaxed position of the hand and wrist. You move from the forearm instead of your wrist, which prevents RSI. The mouse fits comfortably in your hand, and supports your wrist and fingers.Unique features: Customizable buttonsYou can customize the buttons on the HE Mouse to your personal requirements. Award Winning DesignHE Mouse has won the Benelux Office Product Award 2013 due to its innovative design. What causes repetitive strain injury (RSI)? The main cause is frequent and repetitive movements of a part of the body - for example, typing, using a computer mouse a lot etc.