Genuine Dell Optical USB Wired Mouse Dell Part Numbers: 356WK, 5Y2RG, 11D3V, 9RRC7, MS111-P, 330-9456. Features: Connectivity : Wired - 4 pin USB Type A, Tracking Sensor : Optical LED, Cursor Tracking Speed (dpi) : 1000 dpi (Dots Per Inch), Buttons Qty : 3 (Left, right & Scroll Wheel), Dimension (H x L x W) : 35.8 x 112.2 x 63.4 mm , Weight : 90g ±10g(including cable), Cable Length: 1800mm ±50mm.