The Logitech M570 Wireless Ergonomic Trackball Mouse in Dark Gray with a Blue Ball is a right-handed mouse designed for comfort and precision. With optical tracking method and 5 buttons, this trackball mouse offers a unique and efficient way to navigate on your computer. The mouse also includes features such as a scroll wheel, thumb control, and battery status indicator. The included Logitech Unifying Receiver makes it easy to connect wirelessly and start using the mouse right away. The sleek design and custom packaging make this mouse a practical and high-quality choice for any user.