【Ergonomic Design】 This MX ERGO trackball is designed to reduce wrist strain. It offers a comfortable grip and a natural hand position, making it less tiring to use for extended periods. 【High-Precision Tracking】 Equipped with high-precision tracking technology, it allows for smooth operation. It is particularly well-suited for design and editing work. 【Customizable Buttons】 It has multiple customizable buttons, allowing for operation tailored to the user's needs. This is a convenient feature for improving work efficiency. - Brand: logicool - Model Name: MX ERGO - Type: Trackball - Accessories: Instruction manual (see photo) - Color: Black Thank you for viewing. It has been used, but the condition is still good. The USB receiver is missing. I have purchased a new mouse, so I am listing this on Mercari. Thank you for your consideration.