Ordinary mice force your arm into an unnatural, twisted position for hours on end. This ergonomic vertical mouse employs an angled slope to keep your wrist in an ergonomic neutral handshake position. Extended lip support for your little (pinky) finger enables more smooth and comfortable movements of the larger muscle group. Traditional mouse use wreaks havoc on the muscles in your arm and can lead to carpal tunnel, arthritis, tendonitis and ouch – pain! That is why SDG Direct created the Moon Mouse. Four button control – left click, right click, forward & back (for web page browsing); a scroll wheel provides convenient scrolling. It’s scientifically designed by orthopedic experts to alleviate wrist, elbow and shoulder pain. It also offers comfort and muscle support; it feels like gliding in zero gravity. It’s time to work and game without any pain! .