Logitech m220 silent with the same click feel and 90 per cent noise reduction enjoy a quiet experience for yourself and those around you plus m220 silent has a long lasting 18 month battery life a powerful 10 metre wireless range and its small size is perfect to toss in a bag and go sound level comparison with logitech m170 measured by an independent lab and verified by quiet mark actual battery life and wireless range may vary based on your use key features over 9 per cent nois