There is a wall fixture with a pull chain in my powder room. Adding a switch leg to it would be a real bear because of the wall construction, so I have been putting the project off. (I put a three way switch elsewhere in the wall and it took me a full day; don't ask.)
Today I saw a pair of RF switches at the hardware store for half price ($12.50); they are intended to change a single switch to a pair of 3way switchs without any wiring.
I have access to the wire before it goes into the wall for the light and there is a lot of slack. I could cut it, put in a box with the wired switch, and then just put the second switch where I want it. I would just ignore the wired switch and use the RF switch for the light.
Aside from the cost of those AAA batteries, am I overlooking any obvious problems with this scheme?