Generic KV-122 Performance Office Mouse High Precision Gaming Blue Laser Mouse with Controls 800/1600 DPI2000 -Black Perfect ergonomics design Press the high sensitivity, adjustable DPI; E rgonomic design, suitable for right hand, feel good Can run more smooth surfaces; Pulley design, positioning accuracy Press the long design, give you new click on experience; Design, comfortable and durable skid the wheel Easy to desktops and laptops; Using the optical detectors, junk and dust are not accessible, so would not require maintenance work such as cleaning;