The GE Z-Wave In-Wall Smart Light Switch (Toggle) replaces your current light switch, uses existing wiring and remotely controls the on/off functions of your permanently installed lighting and ceiling fans. This smart toggle switch can be used in groups of multiple lights or turned on and off within ambient interior lighting scenes and and provides your home with ultimate flexibility, capable of being used by itself or with up to four GE add-on switching in three, four, five and six-way wiring configurations. Three-way wiring configuration turns the light or appliance on/off from two separate locations. Four-way wiring configuration turns the light or appliance on/off from three separate locations.