Simply Automated UFD-30 Custom Series Fixture Dimmer Module 300W Fixture Dimming Module wires into standard junction boxes for hidden control. Turns on, off or even dims lights. Can also turn on/off a fan if dimming function is disabled. Used in conjunction with Simply Automated dimmer when there is not a neutral (white) and hot (black) wire at the dimmer junction box. Receives lighting scene commands from Simply Automated UPB dimmers, tabletop controllers or scheduler-timer. Utilizes ultra-reliable Universal Powerline Bus (UPB) technology. No new wiring needed! Simply Automated devices transmit and receive lighting scene commands with other Simply Automated UPB dimmers, plug-in modules, fixture modules and other devices  can control virtually any device that connects to AC power wiring anywhere in the home. To ensure a proper installation your home should be no more than 2500 square feet and have only one breaker panel. A phase coupler is required in some home installations. Not intended for use in multi-dwelling (condo, apartment, duplex) units.