Perixx - Wireless USB Trackball Programmable Computer Mouse This ergonomic mouse features a natural-shape platform for comfort, allowing for a more relaxed hand position. It has a 34 mm trackball and seven programmable buttons, providing full control at your fingertips. The design minimizes repetitive wrist and palm movements, helping to prevent long-term muscle soreness. The surface is coated with a special rubber for an excellent grip, ensuring an effortless tracking experience.