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It's called the Couch Mouse because it's optimized for off-desk use. The sealed, rounded, easy-gliding base gives you accurate tracking on cushions, pants, blankets and carpets. The mouse is only active when you grip it, so you can go for up to two years on a single set of two AA batteries. The dual-mode Hyper-Fast Scrolling Wheel coasts smoothly through long web pages with a single spin, or you can switch modes to click one precision-step at a time. You can also move forward or back through web pages just by tilting the wheel right or left. It uses the tiny Logitech Unifying Receiver that works on both Windows and Mac.