If you have a Doorbell Fon system installed in your home for easy intercom communication between visitors at your door and every telephone in the house, you can now convert this system (sold separately) into a whole-house telephone intercom system. The Doorbell Fon Intercom Module connects to your Doorbell Fon system. The Door Strike Controller is mounted on a Universal Mounting Bracket and enclosed in a removable clear plastic case, which can be easily positioned into any structured wiring cabinet or as a stand alone unit. It will convert all phones in home/office into an intercom system. What's Included # Electric Lock Controller - DP-28SW The Electric Lock Controller connects between the Doorbell Fon control box and a doorstrike and power supply.