Etekcity Scroll E1 1600DPI Ergonomic Wireless USB Optical Gaming Mouse (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 Wireless USB connection compatible with USB 2.0/3.0. Comfortable right-handed design with customizable backward/forward thumb buttons High-resolution optical sensor with mini 2.4GHz receiver for up to 30ft range provides consistent, accurate performance High-precision (1600 DPI) with 3 adjustable levels (500/1000/1600) to suit ordinary, casual gaming and high-volume data manipulation needs.Plug and play, compatible with Windows XP/Vista/7/8 and Mac OSX.