Your coffee table. Your favorite chair. Your comfy bed. Now there"s no limit to where you can get precise cursor control. This hand-friendly wireless trackball lets you work and play wherever you want. No mouse to move around. No tricky keypad leaving your hand feeling cramped. Just roll the ball with your thumb and click. Precision never felt so comfortable. Features: * Thumb-operated trackball and laser sensor for smooth, precise cursor control * Works anywhere you do - even your sofa * Powerful 30-foot wireless range with tiny leave-in Logitech Unifying receiver * Up to 18 months of power on a single AA battery * Scroll wheel and back/forward buttons for easy document and web page navigation * Enhanced comfort - refines the time-tested shape of the popular Logitech Trackman Wheel * System requirements: * Windows: XP, Vista, 7; USB port; internet connection for software download * Mac: OS X 10.5 or later; USB port; internet connection for software download What"s In The Box: * Logitech 910-001799 M570 Wireless Trackball Mouse * Logitech Unifying receiver * (1) AA battery * User documentation