[. . . ] [. . . ] The Hub will allow you to connect up to 127 USB devices to your Notebook and comes with a USB 2. 5 Mbps Upstream port 1 B type connector Downstream port 4 A type connectors One power LED One mini DC jack One mini switching power adapter, + 5 V, 2100 mA + 5 V, 500 mA max. 5/12/ 480 Mbps Supports Bus/Self-powered mode 500mA each port (self-powered mode) is reliable at up to 15 feet of transmission Supports hot plug & play One upstream port and four downstream ports One LED to indicate the Hub is ready Downstream ports have automatic connect and speed detection function plus over-current protection with auto recovery Compatible with WIN 98 SE/ME/2000/ XP & Mac OS X In order to get the USB 2. Step 3: Plug the power adapter into the AC outlet of the wall or the power strip (optionally). [. . . ] [. . . ]