Three illuminated numbers always let you know which device you're connected to. Hyper-fast scrolling allows you to fly through long documents and web pages with a spin of the wheel, or switch to click-to-click scrolling when you need precision. Durable design is built to withstand up to 10 million clicks. Large-sized, right-hand design fits comfortably in your palm, and its rubber surface makes it extra soft to the touch. Logitech Flow provides smooth workflow between computers. You'll be able to move your mouse cursor across three computers and even copy and paste text, images and files from one computer to another. Long battery life works up to 24 months on a single AA battery. Customizable design lets you set up and assign tasks to buttons with step-by-step instructions.