Simply Automated UMA-E-W Plug In Relay Module, White Plug-In 12A Relay Module. Turns on/off appliances, heaters, fans, pumps, motors and lights. 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! For new or existing lighting fixtures, lamps, fans and other electrical devices. 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.