Logitech M720 in great working order. Can sync with up to 3 different computers simultaneously and switch between them with the press of a button. 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 MARATHON ENDURANCE - A true athlete, the M720 is designed to endure, with buttons built to withstand up to 10 million clicks 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 LONG BATTERY LIFE- The Logitech M720 just keeps going, with 2 years of power on a single AA battery