Cuitan 2.4GHz 1600 DPI Wireless Optical Mouse for Notebook / Laptop / Computer / PC, 6 Buttons, 3 Adjustable DPI 800/1200/1600, Computer Mouse with USB Receiver, Perfect for Home / Office Use - Blue 6 buttons, 3 adjustable DPI level 800/1200/1600, suitable for home / office use. 2.4 GHz wireless technology, comfortable and convinient to use. Rapid data transmission, stable and precise. 3D gear design mouse wheel, anti-slip and safe to use. On / Off switch to save power, intelligent sleep mode to extend life of the batteries. Need 2* AAA batteries (Batteries are not included). Mini receiver, simply install the batteries, plug the receiver in the USB port of computer and turn on the switch at bottom of the mouse to make it work.