Silence and Flow. The M590 Multi-Device Silent lets you glide through your tasks with noiseless efficiency. With Logitech FLOW, M590 Multi-Device Silent has the almost magical capacity to navigate seamlessly on two computers and copy-paste from one to the other - even if you re using a PC and a Mac. It certainly beats sending yourself emails! M590 also comes with a host of other features to improve your productivity, your way: silent clicks; fast and easy scrolling through long web pages; five programmable buttons, including two handy thumb buttons; a 2-year battery life and a curved, domed shape that supports your palm comfortably during long hours of work or play. Dual connectivity (Bluetooth(R) or 2. 4 GHz Logitech Unifying). Features Copy-paste from one computer to another using Logitech FLOW Silent clicks: Over 90% noise click reduction Fast and easy scrolling through long web pages 2 thumb buttons for extra control 24-month battery life Curved, comfortable design