Used for about 2 years. - Brand: Logitech - Type: Trackball Mouse - Color: Gray - Shape: Ergonomic Design - Number of Buttons: 3 buttons This high-performance trackball mouse is from the Logitech MX series, designed to reduce fatigue in your arms and wrists. Operate the cursor by moving the trackball without moving the body, saving space. Adjustable tilt angle up to 20° / Use the mouse in a more natural hand position, reducing muscle tension by 20% compared to a regular mouse. Precision mode button to change tracking speed / Instantly switch between speed mode and precision mode with the push of a button. Tilt-enabled precision scroll wheel / Horizontal scrolling, middle click, and left/right tilt are possible. Easily switch between up to 2 connected devices with a single button / Easy-switch function. Data transfer between up to 2 devices with just mouse dragging / FLOW function. Connection: Compatible with Bluetooth or Unifying USB. Supported OS: [Bluetooth] Windows 10, 11 or later, Mac OS 10.15 or later, iPadOS 13.4 or later, Chrome [Unifying] Windows 10, 11 or later, Windows 7, Mac OS 10.15 or later Thank you for viewing.