10-LOT Genuine Dell Optical USB Wired Mice 9RRC7, Compatible Dell Part Numbers: Dell Part Numbers: 356WK, 5Y2RG, 11D3V, MS111-P, 330-9456 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