This is one of the useful products  Let your work speak louder than clicks. M331 Silent Plus provides advanced comfort for the right hand, excellent accuracy, long battery life, and broad compatibility all while reducing over 90%1Sound level comparison between Logitech M330 and Logitech M170. Left-click dBA measured by an independent lab at 1m. of clicking sounds. That means the full focus for you and a quieter environment for those around you. Stay focused on your work without noise distractions. Logitech’s  Own SilentTouch Technology reduces over 90%2Sound level comparison between Logitech M330 and Logitech M170. Left-click dBA measured by an independent lab at 1m of clicking sounds, all while ensuring the mouse performs its best. That means you can feel every single click but hear virtually nothing.