UNIQUE ERGONOMIC DESIGN: The wireless vertical mouse is specially designed to provide better support and more comfort for your hands than normal mouse. The unique contoured vertical shape seamlessly fits and moves with your palm, allows smoother movement and prevents wrist pain. PLUG AND PLAY: Adopted advanced 2.4GHz wireless technology, the wireless mouse can be used at a working distance up to 10m with no interference. Enjoy the convenience of a tangle-free, wireless mouse as soon as you insert the USB Nano Receiver into your computer's USB port, no extra drivers required. HIGH RESPONSIVENESS: Switch DPI levels among 800, 1200 and 1600 to meet different needs. Advanced Optical Tracking Technology ensures greater sensitivity for precise tracking on a wide range of surfaces.