This is a wireless LAN adapter compatible with 11ac. By connecting it to your computer's USB port, you can achieve high-speed Wi-Fi communication with 11ac 2x2. It's ideal for those using internet via fiber optic communication or who want to watch high-definition video over Wi-Fi. The maximum transfer speed of USB 3.0 (standard value) is 5Gbps, which is more than 10 times the maximum transfer speed of the conventional USB 2.0 of 480Mbps (standard value). This product is equipped with USB 3.0, so you can fully utilize the speed performance of 11ac. For more details, please see the manufacturer's website below. https://www.buffalo.jp/product/detail/wi-u3-866d.html I am selling this because it is no longer needed in my current PC environment.