USB 2.0/3.0/Lightning Cable Assemblies Stewart Connector / Bel USB 2.0, 3.0, 3.1, and 4.0 and Lightning Cable Assemblies are 'hot-pluggable' connectors. The connection and disconnection of the cables can be done while the computer is running without fear of freezing the computer. These USB cables carry power as well as signals. The USB 2.0, 3.0, 3.1, and 4.0 and Lightning cable assemblies are fast, transferring up to 480Mbps for USB 2.0 and 640Mbps for 3.0 cables.