ADVANCED ERGONOMIC DESIGN - A wireless 2.4GHz ergonomic vertical mouse with intuitive 6 button design. Specifically-designed for medium to large hand-sizes. RELIEF FOR REPETITIVE STRAIN INJURIES (RSI) - Recommended for users who work for particularly long hours on the computer, the vertical design helps to alleviate the wrist and shoulder pain that could be caused by twisting of wrist and forearm when using a standard, non-ergonomic mouse. WIRELESS CONNECTION - 2.4 GHz wireless technology with approximately 33 feet operating distance; Nano USB receiver with a compartment located under the mouse COMFORTABLE GRIP - High quality mouse with rubber coating that provides soft surface and a nice grip. The coating is fingerprints resistant. INTUITIVE DESIGN - Added internet browser buttons for easy naviagaion for page forward and backward, the mouse is also equipped with scroll wheel with middle click function, and DPI switch button.