MT7601 USB WiFi adapters. These adapters allow devices, like desktop computers without built-in WiFi, to connect to a wireless network. They plug into a USB port and act as an external wireless network card, receiving signals from a router and converting them into digital data. The MT7601 is a common model that supports 2.4GHz 802.11b/g/n networks. It's often used to provide a simple way to add or upgrade WiFi capabilities on a device.