Dell 452-BBPG USB 3.0 Triple Display UltraHD Universal Dock - D3100 Ports Spec: 2 x USB 2.0 - 4 PIN USB Type A 3 x SuperSpeed USB 3.0 - 9 pin USB Type A 1 x network - RJ-45 1 x display / video - DisplayPort output - 20 pin DisplayPort 2 x display / video - HDMI - 19 pin HDMI Type A 1 x headphones - output - mini-phone stereo 3.5 mm 1 x audio - output - mini-phone stereo 3.5 mm