Ergonomic Trackball Comfort- This trackball mouse features a 34mm thumb-controlled trackball that moves freely the cursor without moving your wrist frequently. Keep your wrist stay in one place, with its ergonomic design, help to keep your hand rests naturally, reducing wrist and arm strain, while the smooth finger rests fit perfectly in your palm for hours of fatigue-free use. Advanced blue LED sensor ensures high accuracy. 4-Direction Scroll Wheel- Boost your productivity with a 4-direction scroll wheel that makes navigating documents, spreadsheets, excel data, and web pages seamless and efficient. Enjoy intuitive control and improved workflow, whether you're working on creative projects or handling everyday tasks. Customizable Buttons with Software- Download sanwa software and you can customize button functions to suit specific needs, such as media control, double click, for/backward, cut/paste/close window, etc. Personalize your experience for design, gaming, or off