CROSS-COMPUTER CONTROL - Game-changing capacity to navigate seamlessly on three 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 HYPER-FAST SCROLLING - Scroll through long documents or web pages faster and easier. Or press the wheel and shift to click-to-click mode for precise navigation WORKS ANYWHERE - 4000-dpi Darkfield sensor tracks flawlessly virtually anywhere, even on glass RECHARGABLE BATTERY - Up to 70 days of power on a single charge