UNITEK 10-Port USB 3.0 Hub with 12V 4A Power Adapter for Apple MacBook Pro Air, iMac, Mac Mini, ChromeBook Pixel, Microsoft Surface Pro, Lenovo Yoga, Laptops, Ultrabooks and Tablet PCs 4 Port USB Hub - SuperSpeed USB 3.0 specification supports transfer rates up to 5 Gbps. Backwards compatible with USB 2.0 Plug and play. Supports hot swapping. No install driver needed. Easily expand to 4 USB 3.0 ports with built-in surge protector? Mains powered - Power adapter provides higher and more stable power to USB devices.Power Switch on/off Backward compatible with Hi-Speed (480Mbps), Full-Speed (12Mbps), and Low-Speed (1.5Mbps)?