5-LOT Genuine Dell 9RRC7 Optical USB Wired Mice, Compatible 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) Lot of 5 each Dell USB MS111-P Mouse