The Enerlites WF3K-W is a companion switch and easily add 3-way lighting control to the Enerwave Smart Wi-Fi dimmer switch (WF500D) with this auxiliary dimmer switch. Users can control the switches from opposite ends of a hallway, staircase, large room, or anywhere else a 3-way application is desired. This add-on switch will mirror the same functions as the dimmer it is paired with. Use this add-on switch to reduce energy consumption and provide more convenience