Logitech G100s Optical Gaming 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 Exclusive 2500 DPI Delta Zero Optical Sensor: Built for consistent, high-accuracy targeting and cursor control Ultra-durable: Rugged buttons and low-friction feet, rated to last an amazing 20 million clicks and 250 km Advanced surface materials: Feel the difference with hydrophobic coatings that help you prevent your hand from sticking to the mouse Comfortable ambidextrous shape: Helps reduce hand fatigue during long gaming sessions, no matter what your hand size or grip style