Product description Ergonomic work made easy, minimize the impact on health of long periods of work at the PC The vertical design allows for a neutral posture and offers a high level of comfort. This means your arm is in a neutral and untwisted position when working on a laptop and not forced into a crooked posture like when working with a conventional mouse. Just try it: Put your arms relaxed on the table and pay attention to the natural hand position - the palms point towards each other as if to shake hands. This is exactly where this vertical mouse comes in: Just like when you shake hands, your arm will remain in a relaxed position. Your hand also becomes supported by ergonomic design and non-slip mouse surface. USB mouse has right and left mouse button and forward / back button for convenient use Surf the net and a dpi selector with which you can set the sampling rates of 1000-1600 dpi switch. Thanks to an optical sensor, the vertical USB mouse works with the highest precision on almost any surface. Product summary: Ergonomic USB mouse / vertical version . USB 2.0 / optical sensor / sampling rate 1000 - 1600 dpi (ly selectable). Works on almost any surface with the highest precision . Better handling than conventional mice.