Plug-In Phase Coupler for clothes dryer (PN: ZPCI-P30A) boosts signals between phases in a home and plugs into standard 30Amp (NEMA 10-30) clothes dryer outlets * Universal design passes UPB, X10 and other higher frequency powerline signals * Makes ultra-reliable Universal Powerline Bus (UPB) technology even more robust; No new wiring needed * Simply Automated devices transmit and receive lighting scene commands with other UPB dimmers, UPB plug-in modules, UPB 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