What makes this work / or be unworkable ?

[petemoore]

  Don't assume anything, I think it's not IR but uses RF to control a switch, as we know one switch can easily lead to another, but remote is the desired unobtanium.

http://www.gadgetshack.com/wireless-doorbell-buzzer-push-button.html
 
  Says a light flashes and a buzzer buzzes when the remote button is pushed, these states could easily be substituted for say true bypass switching states.
  I wound'nt need or want:
  Unwanted RF [or other] noise from remote getting into audio system
  Unwanted RF [or other] from audio interfering with remote.
  Flashing [well maybe, rather start with an on/off state]
  Buzzer [maybe it's on/off state, would require more current than an LED?
  Other than that it looks like an on off state thing with remote control.
  RF communication I suppose?, since infrared wouldn't work through a door.
  100' range is more than enough, 50' or even 25' could do work for me.
  I'm lazy, sure, but sometimes I just don't have time to get up and reset something.

[PRR]

http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=ICI1C