Sabrent 4 Port Portable USB 2.0 Hub (9.5" cable) for Ultra Book, MacBook Air, Windows 8 Tablet PC (HB-MCRM) Expand by connecting up to 4 USB 2.0, or 1.1 devices to any USB 2.0 capable computer Compatible with all Windows/Mac/Linux systems. Supports USB 2.0 transfer rates up to 480 Mbps. Backwards compatible with 1.1 devices and hosts Reverse Compatible with USB 1.1