Sabrent USB 3.0 4-Port High Powered Hub with 4A Power adapter Reverse compatible to USB 2.0 (HB-W4U3) Compatible with all Windows/Mac/Linux systems. Supports USB 3.0 transfer rates up to 5Gbps. Backwards compatible with all USB 2.0/1.1 devices and hosts Powerful 4A adapter to power up high powered devices.