The OEM Logitech M570 Trackball is a wireless, laser trackball mouse designed for comfort and efficiency. Its sculpted shape supports your hand, allowing you to rest your arm while navigating. The Logitech Unifying USB receiver stays in your laptop and enables connection with up to six compatible devices. With USB and 2.4GHz wireless connectivity, you can control devices from up to 30 feet away. This trackball is compatible with Windows XP, Vista, and 7, as well as Mac OS X 10.5 or later.