This is a XikeStor 10G USB 4 Ethernet adapter. It works perfectly and at 10G speeds. It supports 10G, 5G, 2.5G, and 1G. There is fan inside the adapter and it is a little loud. This adapter REQUIRES a USB4 or a Thunderbolt port! It will not work on normal USB ports. It runs a Marvell Aquatia 10G chip internally. Message if you have any questions.