Etekcity Scroll S200 High Precision 1600 DPI Wired USB Optical Mouse with Side Control, Ergonomic and Symmetrical Design (Certified Refurbished) This Certified Refurbished product is tested & certified by Etekcity to look and work like-new. The product includes all original accessories, and is backed by a 90-day warranty High-precision optical sensor for responsiveness and stability, easily adjust sensitivity between 600/1000/1600 DPI Symmetrical And Ergonomic Design, Suitable for Both Right And Left Hands; Forward and Backward Function Designed on the Left Side Cool Lighting: Built-in Astonishing Blue Light Compatible with Windows XP/Vista/7/8/Mac OSX and Linux