ZyXEL PLA401V4KIT is a Powerline Ethernet Adapter that allows you to create a wired network using your home's electrical wiring. This can be useful for extending your network to areas of your home that are not covered by Wi-Fi, or for creating a more stable connection for devices that are sensitive to latency, such as gaming consoles or streaming devices. The PLA401V4KIT includes two adapters, which you plug into two different power outlets in your home. Once the adapters are plugged in, they will automatically create a secure, encrypted connection between them. You can then connect your devices to the adapters using Ethernet cables.