Logitech - M570 Wireless Trackball Mouse (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com Trackball comfort: Sculpted shape supports your hand and stays in one placemove the cursor without moving your arm Work and play anywhere: Get smooth, precise cursor control wherever you use your trackballyour desk, couch, even your bed Logitech Unifying receiver: Connect up to six Unifying compatible devices with one tiny wireless. Compatible with Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 and Mac OS X 10.5 or later