The Philips wireless phone jack uses the electrical system of you home to provide a landline phone jack in a room that lacks one. Plug the transmitter into an outlet in a room with a phone jack, then connect it to the existing jack. Plug the receiver into an outlet in a room that lacks a phone jack, then connect it to you phone. This system worked very well in my previous residence, but experiences electrical noise in my current residence, so it isn't guaranteed to work perfectly in all cases. Includes manual. I'm including a phone ringer/flasher that can be paired with the Philips or plugged into a phone jack in a room that doesn't have a phone to alert you with audio or visual signal to incoming calls.