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 Hyper-fast scrolling lets you fly through long documents and Web pages. Wireless operating distance: Approximately 10 square meters The sculpted, right-hand shape guides your hand to a naturally comfortable position. Battery type: 2 AA batteries The tiny Logitech Unifying receiver stays in your notebook. The receiver is located in the back of the mouse within the battery compartment System Requirements: Operating Systems: Windows 7. Windows Vista. Windows XP. Mac OS X 10.4 or late. Green Compliance: Yes. Green Compliance Certificate/Authority: RoHS. WEEE.