Plugable 4-Port Aluminum USB 3.0 SuperSpeed Hub with Dedicated 2.1A Charging Port and 30W Power Adapter (VIA VL812 Rev B2 Chipset with v9081 firmware. Windows, Mac OS X, and Linux support. Full USB 2.0 backwards compatibility) Expand USB connectivity by connecting up to four USB 3.0, 2.0, or 1.1 devices to any USB 2.0 or 3.0 capable computer plus 1 dedicated 2.1A charging port. The red dedicated charge-only port charges devices at up to 2.1 amps (depending on the device) even when no host PC is present. Robust 12 volt 2.5 amp 30 watt power supply included. (US AC Wall Outlet Plug, 100-240V 50/60Hz) Compatible with most Windows 8.1, 8, 7, Vista, XP, Mac OS X, and Linux / Unix systems. Microsoft Windows systems should install latest manufacturer USB 3.0 host controller drivers and Windows Updates. Apple Mac OS X and Linux / Unix systems require latest operating system updates for best compatibility. Apple notes: Note that some devices such as the Apple SuperDrive look for Apple-specific signaling and will not work when connected through any USB hub. Not recommended for use with USB 3.0 PCI-e add-on cards for older Mac Pro systems because of limitations in their software support for USB 3.0 hubs. Supports USB 3.0 transfer rates up to 5Gbps (640MBps) to allow data to move quickly between devices. Transfer rates are device and USB host controller dependent. Ideal for high-throughput devices such as USB hard drives, flash drives, and USB video adapters. Backwards compatible with all USB 2.0/1.1 devices and hosts. Powerful 12 volt 2.5 amp 30 watt power adapter. 5 blue LEDs, one per USB port. Sleek brushed aluminum matte finish designed to complement high end Apple products. All 5 ports on one side to minimize cable clutter and maximize accessability.