How do I add built-in wireless Wi-Fi to a desktop computer motherboard without using up external USB slots? The TP-Link TL-WN881ND is a 300Mbps Wireless N PCI Express internal network card that installs directly into standard desktop expansion slots. Outfitted with two high-gain external antennas, this internal Wi-Fi adapter delivers excellent signal range and connection stability for online video streaming and large office downloads.