The USB 2.0 Hi-Speed hub 4x for the 3.5" slot provides connectivity for up to 4 devices. The device doesn't need a PC-slot. Power supply is provided by the included power adapter cable. The hub is connected via the 100cm USB-cable to an existing USB-port of the PC. The big advantage lies in the possibility to connect the max. 4 devices on the front side of the PC. This saves you from "crawling behind the PC".