https://www.techradar.com/news/microsoft-pro-intellimouse-aims-to-be-the-perfect-mouse-for-gaming-and-work

Microsoft is again revamping the classic IntelliMouse, this time adding features to make it more suitable for gamers.

The Microsoft Pro IntelliMouse boasts an upgraded tracking sensor which is more sensitive to let you move and aim with greater precision (or that’s the idea), and benefits from more responsive buttons with improved actuation.