This Certified Refurbished product is tested and certified by the manufacturer or by a third-party refurbisher to look & work like new, with limited to no signs of wear. The refurbishing process includes functionality testing, inspection, reconditioning and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty & may arrive in a generic white or brown box.Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon. Contoured shape with soft rubber grips provide all-day comfort Back/forward buttons and side-to-side scrolling plus zoom let you do more, faster Requires Logitech SetPoint software 2-year battery life practically eliminates the need to replace batteries Battery life may vary based on user and computing conditions Comes with a tiny Logitech Unifying receiver that stays in your computer - plug it in, forget it