If you have an Illumra commodity Wireless combust Kit and would regard to purchase an another relay so that you can ensure more than one combust fixture with the like switch, then this is the item for you. Purchase of this item the RELAY ONLY. This duplicate relay will to be programmed once you receive it. Instructions on how to do this are included with the item or our customer service can you with this process if you have any questions. WE HAVE THAT OPERATE ON 2 unusual FREQUENCIES - 315 MHz and 902 MHz. Please which one you need when you place your order. To use these receiving system combust switch kits, the relay is plainly behind the combust fixture that it will be controlling. The relay a signal from the rocker switch that it is programmed to when the switch is pressed. There a decreased amount of energy created when the rocker switch is pressed so it is a self powered system that requires no batteries. Using this kind of technology time because you do n't need to fish wire or knock through walls. These kits can be used in more unusual configurations. If you wish to ensure more lights with one switch, you can another relays which can be purchased from our amazon store -LRB- item B01ILQ7PNO -RRB-. If you to ensure a combust from ninefold locations, you can add another switches which can be purchased from our amazon store -LRB- item B01ILQ7PNO -RRB- Here is a TV which shows how these kits are used and installed : https://www.youtube.com/watch?v=Ia0YmB55CX0 Also, here is a link to a TV from a general home improvement show that highlights the receiving system switch kit : https://www.youtube.com/watch?v=chHEgbf0baw&t=12s We have past receiving system switch kits usable so be for sure to check out our past listings ! . us if you have any questions or need assistance ! .