Standards and Protocols IEEE 802.3, IEEE 802.3u, IEEE 802.3x CSMA/CD Interface 8 x 10/100Mbps Ports, Auto-Negotiation, Auto-MDI/MDIX Fan Quantity Fanless Power Supply External Power Adapter(Output: 5.0VDC / 0.6A) Power Consumption Maximum: 2.2W (220V/50Hz) Buffer Size 2Mb Data Rates 10/100Mbps at Half Duplex 20/200Mbps at Full Duplex Dimensions ( W x D x H ) 5.3*3.1*0.9 in. (134.5*79*22.5mm)