Realtek 8821CU Wireless LAN 802.11ac USB NIC is a network card launched by Realtek manufacturer. Many computer manufacturers integrate this network card into the whole product, The original intention of Realtek manufacturer to design this wireless network card is for those who have high requirements for network speed. Realtek 8821CU Wireless LAN 802.11ac USB NIC can not only work well by itself, but also can be combined with wireless network cards of the same model to form a parallel working mode, so as to increase the bandwidth of the network, which can speed up the network data transmission speed, If your computer is an old-fashioned device, don’t worry, because this network card has good compatibility and can be used with various computer hosts, Nowadays, more and more people are shopping online. Realtek manufacturers also take this into consideration, so they add encryption function to Realtek 8821CU Wireless LAN 802.11ac USB NIC, which can encrypt data before transmitting to external devices. However, this function is not enabled by default. The encryption function will be enabled only when you set it in the control interface of the driver, In the device control panel, you can set the Realtek 8821CU Wireless LAN 802.11ac USB NIC to reduce its signal transmission strength, so that it will generate less heat and work more stable, Finally, please install the correct driver for it, so that it can exert its maximum performance.