ERGONOMIC VERTICAL MOUSE: Designed by leading physiotherapists in the UK, the DXT was engineered to promote a neutral, more vertical wrist posture while allowing the hand to work with a light touch fingertip hold providing precision cursor control. RELIABLE USB WIRED CONNECTION: Plug-and-Play for Windows, Mac & Android FINGER TIP GRIP INCREASES PRECISION Because you hold the DXT in your finger tips, its comfortable for a wide range of hand sizes. However, the DXT 3 is approximately 15% larger than the DXT 2. Please refer to the Sizing Chart to determine which model is appropriate for your hand size. IDEAL FOR RIGHT AND LEFT HANDERS: Switch instantly between right and left handed use with the tap of a button. No changes to button-assignments in the operating system are required. FOR FINGERS WITH A TOTAL SPAN OF 2.75 OR WIDER: Refer to Sizing Chart.