Kensington Pro Fit Ergo Vertical Wireless Trackball 9 Compatible with Windows and Authentic Product with Warranty Mouse, Buttons, Bluetooth, macOS,

The ergonomic design allows you to work with your wrists and palms in a natural position, similar to a handshake, making it comfortable to work on your PC for long periods of time. It's easy to use and even mouse users can easily switch over to it. It has the same right-click and left-click buttons and scroll wheel as a mouse, but also has the trackball functionality of a thumb. Precise Control and Speedy Operation: A high-quality optical tracking sensor, 34mm ball, and 3-level DPI switch enable smooth, precise, and accurate cursor control. The Pro Fit Ergo Vertical Wireless Trackball can connect to three different devices simultaneously: one with a 2.4GHz nano receiver (which can be stored inside the trackball) and two Bluetooth connections. Plug & Play for easy start, customizable button assignments. Use the default settings with Plug & Play right away, or launch KensingtonWorks to customize the nine buttons with pointer and scrolling options. Comfort in the palm of your hand. The Kensington Pro Fit Ergo Vertical Wireless Trackball is ergonomist-approved for comfort and ease of use. The 60-degree tilt position allows for optimal wrist and forearm positioning when using a mouse. The trackball's mouse-like feel makes it easy to transition from using a mouse, and it features nine programmable buttons. It allows you to work with proper wrist, arm and shoulder positioning for maximum comfort and pain reduction.