Open the lines of communication with the Power Gear In-Wall Duplex Adapter. The adapter supports a phone and additional device with a single jack to expand your home or office phone system. Answering machines, modems and fax machines can be linked using the simple, plug-in adapter to create an organized, professional appearance.To build your network, connect the duplex adapter to any modular jack. The adapter’s ports have four contacts to support RJ14 and RJ11 connectors. In only a few steps, you’ll enhance the efficiency of your communication equipment. Get more from your phone line with the Power Gear In-Wall Duplex Adapter.