all metallic small box that inspires confidence, with an autonomous power supply 220v 4 usb3 front ports + 1 on top (useful for eg a USB key for the wireless mouse) a fourth port on the front loading of a dedicated MP3, GPS or any other need proper flow on usb3, far faster than qu'usb2 or 1 fully compatible with my Windows 8.1, permanently connected to the power supply and the use of an external hard drive 2.5 500gb in short, carefree meets my needs via my laptop Amazon, as usual, chrome nickel!