Cross-computer Control - Game-changing capacity to navigate seamlessly on two computers, and copy-paste text, images, and files from one to the other using Logitech FLOW Dual-connectivity - Use with up to three Windows or Mac computers and laptops via included Unifying receiver or Bluetooth Smart wireless technology Long Battery Life - The Logitech M585 just keeps going, with 2 years of power on a single AA battery Ultra-precise Scrolling - Micro-precision wheel packs more grooves per millimeter to make scrolling through long webpages faster and easier Curved Design - Domed shape provides right or left hand support for your palm comfortably during long hours of work or play