Etekcity Ergonomic Wireless USB Optical Mouse with 2.4GHz Nano Receiver, 6 Buttons (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 (1600 DPI) with 3 adjustable levels (1000/1200/1600) to suit ordinary, casual gaming and high-volume data manipulation needs High-resolution X5 optical engine sensor with mini 2.4GHz nano receiver for up to 30ft range provides consistent, accurate performance Ergonomic right-handed design with thumb control for back/forward navigation, up to 5 million clicks over a life time Highly accurate DSP; Auto-shutoff feature conserves power and extends battery life. Compatible with Windows, Mac, and Linux