3 x Powerline Add-On Adapters for wireless internet using the electrical wiring in your home or office.

1 x Devolo dLAN 500 AVtriple+ (3 ports for 3 devices in the same room)
2 x Devolo dLAN 500 duo+ (2 ports each for 2 devices in the same room)

Connect your router to one of the adapters using an RJ45 cable (not included).

Plug one of the other adaptors into the electric socket of another room.  Connect the adaptor to your device with another RJ45 cable. (not included).

Useful for when you don't want WiFi in a room or when WiFi won't reach due to thick walls or distance.