802.11n Wi-Fi USB Adapter - 2.4GHz Nano Dongle

Five dollars to put a dead desktop or an old laptop back on the network. It is 2.4 GHz only and 802.11n only, which in 2026 is the slower half of every router — but 2.4 GHz also travels furthest through walls, so for a machine at the other end of the house it is not the wrong choice.

Thirteen channels, 20 dBm transmit power, and drivers for everything from Windows XP through Windows 11 plus macOS and Linux, which is a wider net than most adapters cast. If the machine is in the same room as the router, spend three dollars more on the dual-band version instead.