Generic KV-089 Performance Office Mouse High Precision Gaming Blue Laser Mouse with Controls 800/1600 DPI included -Blue offers the best in gaming at the best price Sleek micro switch for incredible clicking speed Durability is increased with UV cured coating Counterweighted for balance and playing "feel" the left mouse design of forward and backward, the two side key, the default is "forward / backward" button to the browser and explorer, fast switching users before different pages and directory, improve user daily use efficiency in the certain extent