Model No.: W536 High precision1600DPIoptical engine 4 high precision hyper response buttons Long transmission distance up to 10 meters Powered by 2 x AAA batteries (not included) Ultra-precise scroll wheel for better browsing web Elegant simple and exquisite wheel design, fine touch and high taste 4GHz rapid wireless transmission with no delay and powerful interference resistance Nano micro receiver can be fixed on mouse bottom and makes it convenient for you to take over and collect Suitable for game enthusiasts, fashionable young, commercial office crowd, long time computer workers