Logitech silent plus mouse M330 SilentTouch Technology Left/Right-click, Middle click, Scrolling and Gliding have been noise reduced 1Sound level comparison between Logitech M330 and Logitech M170. Left click dBA measured by an independent lab at 1m. Sensor Technology High Precision Optical Tracking DPI (Min/Max): 1000± Buttons Number of Buttons: 3 (Left/Right-click, Middle click) Customization app Supported by Logi Options+ on Windows and macOS 2Available on Windows and macOS at logitech.com/optionsplus Scrolling Line-by-line scrolling Scroll Wheel: Yes, Rubber, 2D , mechanical