Simply Automated ZPCI-B Phase Coupler Breaker Box Breaker-Panel Phase Coupler (PN: ZPCI-B) boosts signals between phases in a home. Fits two breaker positions in a standard breaker panels (Murray/Crouse Hinds  MP, Siemens  QP, Cutler Hammer/Eaton  BR or CL, GE  THQL or THQP, and SquareD  HOM). Universal design passes UPB, X10 and other higher frequency powerline signals Makes ultra-reliable Universal Powerline Bus (UPB) technology even more robust. No new wires needed! Simply Automated devices can transmit and receive lighting scene commands with other UPB dimmers, UPB plug-in modules, UPB fixture modules and/or 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.