1 x Monitor/Video Port (15 pin D-Sub) 1 x 10/100 Base-T Ethernet (RJ-45) Jack 1 x Serial Port 1 x Stereo Audio-Out Jack (3.5 mm for speakers or headphone) 1 x Mono Audio-In Jack (3.5mm for microphone) 4 x Hi-Speed USB 2.0 Ports (two Power Ports and two standard USB ports both are backward compatible with USB 1.1 devices and support transfers up to 480Mbps)