The exemption is ineffective. This device is the TP-Link Archer T4U AC1300, a USB Wi-Fi adapter for computers. TP-Link Its primary function: If a desktop computer or laptop does not have strong Wi-Fi, connect the device to the USB port to be able to connect to the router wirelessly. It works on 2.4GHz and 5GHz. The theoretical speed reaches up to 400 Mbps on 2.4GHz and 867 Mbps on 5GHz, with a total AC1300 rating. TP-Link It has high-gain antennas to improve the range and stability of the Wi-Fi signal. It uses USB 3.0. It supports technologies such as MU-MIMO and Beamforming.