• Connectivity technology : Docking• USB 2.0 ports quantity : 3• USB 3.0 (3.1 Gen 1) Type-A ports quantity : 2• Ethernet LAN (RJ-45) ports : 1• VGA (D-Sub) ports quantity : 1• DisplayPorts quantity : 1• DVI-D ports quantity:  1• Microphone in : Yes • Headphone outputs: 1• Ethernet LAN: Yes  • Compatibility: Precision M4700, M4800, M6700, M6800