By integrating an intercom system into your Greyfox Structured Wiring Distribution System, you'll be able to communicate with your family over inexpensive cat. 5 wiring. Add a cat. 5 Intercom Desktop Unit to your Greyfox Intercom System to link another room in your home to your communication system. Each Intercom Desktop Unit provides hands-free intercom communication, monitoring, and mute in any room, and since each comes with a 12-foot patch cable, you'll be able to place one on your nightstand, desk, and kitchen counter easily. The Intercom Desktop Unit is powered by and requires the Cat. 5 Intercom Module, which installs directly in your Greyfox enclosure. Both the Cat. 5 Intercom module and the Greyfox enclosure are sold separately.# Intercom # 12-foot patch cable # Instructions