USB 3.1 (Gen 1) is poised to become main stream. Our 4 ports USB 3.1 (Gen 1) Hub is offering 4 extension ports for USB 3.1 and backwards compatible with both USB 1.1 and 2.0 specifications. Once an USB 3.1 (Gen 1) device is attached to PC via this Hub, user will be enjoying up to 5Gbps of transfer speed. 4 Downstream and 1 Upstream Ports, Compliant with Universal Serial Bus 3.0 Specification Revision 1.0, Supports Simultaneous Operation of Multiple USB 3.1, USB 2.0 and USB 1.1 Devices, Up to 5Gbps Data Transfer Rate, Hot-swapping Feature Allows you to Connect/Disconnect Devices Without Powering Down the System, No Device Driver Required for Hub Installation