The D-Link DWA-121 Rev.A Wireless Adapter is a compact and reliable USB WiFi adapter designed to provide wireless connectivity to desktops, laptops, and other compatible devices. Operating on the 2.4GHz frequency band, it supports the IEEE 802.11n standard, offering data transfer rates of up to 150Mbps. The adapter features WEP, WPA, and WPA2 encryption support, ensuring secure wireless connections to networks. Its plug-and-play design allows for easy installation and setup, making it convenient for users to add WiFi capabilities to their devices. The DWA-121 Rev.A is an ideal solution for users seeking reliable wireless connectivity in a compact form factor.