SILENT PRODUCTIVITYPowerful, precise, and silent, M590 is designed to perform, so you can, too. The curved, right-handed shape lets you work comfortably for hours, while the compact design and up to two years of battery life1Battery life may vary based on use and computing conditions. give you the freedom to take your work anywhere. The five programmable buttons and multi-device flow boost your productivity-silently thanks to the 90%2Sound level comparison between Logitech M590 and Logitech M170. Left click dBA measured by an independent lab at 3.3 feet(1m). reduction of clicking sounds. That means the full focus for you and a quieter environment for those around you.