This is a junk item. The middle mouse button sometimes doesn't respond well when clicked. Scrolling works fine. Please refrain from purchasing if you are sensitive to imperfections. One of the mouse feet is missing. - Brand: Logitech - Model Name: PRO Wireless - Color: Black - Features: Lightweight design - Sensor: Optical sensor - Connectivity: Wireless - Number of buttons: 6 buttons - Intended use: Gaming - Anti-slip: Rubber grip Thank you for looking.