t most major home and electrical stores they sell a kit for your exact situation. Essentially, the kit contains two switches. One replaces your existing one, hooks up to the wires and everything just like the original. The other comes with its own surface mount box, and you mount it wherever you want the other control for the light or outlet to be. This second switch takes a small battery. The kit I osed also allowed for flush-mounting the new second switch, so one canít tell the difference.
When everything is hooked up properly, the system will work exactly like a 3-way. I canít remember the price, but itís really simple to install. I also canít remember the name, but itís something like "wireless 3-way switch kit". Just ask, they will know what you mean.