Microsoft Surface Wireless Pen for Surface Pro 3 - Dark Blue (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 resulting product includes all relevant accessories, comes with a minimum 90-day warranty, and may arrive in a generic box. Only sellers who meet a high performance bar may offer Certified Refurbished products on Amazon.com Designed for Surface Pro 3 Connects to Surface via Bluetooth 4.0 Battery powered Palm Block technology ignores the pressure from your hand when it senses you're using Pen