Office Optical 1000 DPI Black, Yellow Ambidextrous USB Type-A Scroll type: Wheel Buttons quantity: 4 1.8 m The Adesso iMouse W3 Waterproof Mouse with Magnetic Scroll Wheel is the ideal pointing device for the industrial, medical and maritime industries because it is 100% waterproof and offers unique washing capabilities to eliminate germs and bacteria. The mouse also provides a unique scroll wheel design with 4 internal built-in magnets to prevent open spaces and add air-tight gaps which prevent any moisture or liquids accidentially getting inside the mouse. Finally,the optical sensor technology keeps the device precisely on point and lets you work on most of glass, wood, marble and leather surfaces without the need a mouse pad. Mouse Recommended usage Universal Buttons type Pressed buttons Buttons quantity 4 Scrolling directions Vertical Number of scroll wheels 1 Scroll type Wheel Movement resolution 1000 DPI Movement detection technology Optical Device interface USB Type-A Purpose Of