Interfaces: Keyboard / mouse : 4 x 4 pin USB Type B ¦ Display / video : 8 x DVI-Analog/Digital - 29 pin combined DVI ¦ Microphone : 4 x mini-phone 3.5 mm ¦ Speakers : 4 x mini-phone stereo 3.5 mm ¦ Keyboard : 1 x 4 pin USB Type A ¦ Mouse : 1 x 4 pin USB Type A ¦ Display / video : 2 x DVI-Analog/Digital - 29 pin combined DVI ¦ Hi-Speed USB : 1 x 4 pin USB Type A ¦ Microphone : 1 x mini-phone 3.5 mm ¦ Speakers : 1 x mini-phone stereo 3.5 mm