Turcom 12 Port Ports USB 2.0 Monster USB HUB W/ac Adapter Power Station for USB Devices Help organize your desktop with this hub that has 1 upstream to 12 downstream USB ports. Automatic over-current protection for each port;DC jack for connecting an external AC power supply (included). Supports USB switching methods. Asynchronous notification to eliminate the need for host polling to determine if a device has been added, removed, and hot-plugged. Connect 12 USB devices to your computer & power 12 USB devices without computer;Supports up to USB 2.0 480Mb/sec transfer rates.